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- | mso-fareast-theme-font: | + | |
- | mso-hansi-font-family: | + | |
- | mso-hansi-theme-font: | + | |
- | mso-bidi-font-family:" | + | |
- | mso-bidi-theme-font: | + | |
- | color:# | + | |
- | mso-themecolor: | + | |
- | mso-fareast-language: | + | |
- | p.MsoFootnoteText, | + | |
- | {mso-style-noshow: | + | |
- | mso-style-priority: | + | |
- | mso-style-link:" | + | |
- | margin: | + | |
- | margin-bottom: | + | |
- | mso-pagination: | + | |
- | font-size: | + | |
- | font-family:" | + | |
- | mso-ascii-font-family: | + | |
- | mso-ascii-theme-font: | + | |
- | mso-fareast-font-family: | + | |
- | mso-fareast-theme-font: | + | |
- | mso-hansi-font-family: | + | |
- | mso-hansi-theme-font: | + | |
- | mso-bidi-font-family:" | + | |
- | mso-bidi-theme-font: | + | |
- | mso-fareast-language: | + | |
- | p.MsoCaption, | + | |
- | {mso-style-priority: | + | |
- | mso-style-qformat: | + | |
- | mso-style-next: | + | |
- | margin-top: | + | |
- | margin-right: | + | |
- | margin-bottom: | + | |
- | margin-left: | + | |
- | mso-pagination: | + | |
- | font-size: | + | |
- | font-family:" | + | |
- | mso-ascii-font-family: | + | |
- | mso-ascii-theme-font: | + | |
- | mso-fareast-font-family: | + | |
- | mso-fareast-theme-font: | + | |
- | mso-hansi-font-family: | + | |
- | mso-hansi-theme-font: | + | |
- | mso-bidi-font-family:" | + | |
- | mso-bidi-theme-font: | + | |
- | color:# | + | |
- | mso-themecolor: | + | |
- | mso-fareast-language: | + | |
- | font-weight: | + | |
- | span.MsoFootnoteReference | + | |
- | {mso-style-noshow: | + | |
- | mso-style-priority: | + | |
- | vertical-align: | + | |
- | p.MsoAcetate, | + | |
- | {mso-style-noshow: | + | |
- | mso-style-priority: | + | |
- | mso-style-link:" | + | |
- | margin: | + | |
- | margin-bottom: | + | |
- | mso-pagination: | + | |
- | font-size: | + | |
- | font-family:" | + | |
- | mso-fareast-font-family: | + | |
- | mso-fareast-theme-font: | + | |
- | mso-fareast-language: | + | |
- | p.MsoListParagraph, | + | |
- | {mso-style-priority: | + | |
- | mso-style-unhide: | + | |
- | mso-style-qformat: | + | |
- | margin-top: | + | |
- | margin-right: | + | |
- | margin-bottom: | + | |
- | margin-left: | + | |
- | mso-add-space: | + | |
- | line-height: | + | |
- | mso-pagination: | + | |
- | font-size: | + | |
- | font-family:" | + | |
- | mso-ascii-font-family: | + | |
- | mso-ascii-theme-font: | + | |
- | mso-fareast-font-family: | + | |
- | mso-fareast-theme-font: | + | |
- | mso-hansi-font-family: | + | |
- | mso-hansi-theme-font: | + | |
- | mso-bidi-font-family:" | + | |
- | mso-bidi-theme-font: | + | |
- | mso-fareast-language: | + | |
- | p.MsoListParagraphCxSpFirst, | + | |
- | {mso-style-priority: | + | |
- | mso-style-unhide: | + | |
- | mso-style-qformat: | + | |
- | mso-style-type: | + | |
- | margin-top: | + | |
- | margin-right: | + | |
- | margin-bottom: | + | |
- | margin-left: | + | |
- | margin-bottom: | + | |
- | mso-add-space: | + | |
- | line-height: | + | |
- | mso-pagination: | + | |
- | font-size: | + | |
- | font-family:" | + | |
- | mso-ascii-font-family: | + | |
- | mso-ascii-theme-font: | + | |
- | mso-fareast-font-family: | + | |
- | mso-fareast-theme-font: | + | |
- | mso-hansi-font-family: | + | |
- | mso-hansi-theme-font: | + | |
- | mso-bidi-font-family:" | + | |
- | mso-bidi-theme-font: | + | |
- | mso-fareast-language: | + | |
- | p.MsoListParagraphCxSpMiddle, | + | |
- | {mso-style-priority: | + | |
- | mso-style-unhide: | + | |
- | mso-style-qformat: | + | |
- | mso-style-type: | + | |
- | margin-top: | + | |
- | margin-right: | + | |
- | margin-bottom: | + | |
- | margin-left: | + | |
- | margin-bottom: | + | |
- | mso-add-space: | + | |
- | line-height: | + | |
- | mso-pagination: | + | |
- | font-size: | + | |
- | font-family:" | + | |
- | mso-ascii-font-family: | + | |
- | mso-ascii-theme-font: | + | |
- | mso-fareast-font-family: | + | |
- | mso-fareast-theme-font: | + | |
- | mso-hansi-font-family: | + | |
- | mso-hansi-theme-font: | + | |
- | mso-bidi-font-family:" | + | |
- | mso-bidi-theme-font: | + | |
- | mso-fareast-language: | + | |
- | p.MsoListParagraphCxSpLast, | + | |
- | {mso-style-priority: | + | |
- | mso-style-unhide: | + | |
- | mso-style-qformat: | + | |
- | mso-style-type: | + | |
- | margin-top: | + | |
- | margin-right: | + | |
- | margin-bottom: | + | |
- | margin-left: | + | |
- | mso-add-space: | + | |
- | line-height: | + | |
- | mso-pagination: | + | |
- | font-size: | + | |
- | font-family:" | + | |
- | mso-ascii-font-family: | + | |
- | mso-ascii-theme-font: | + | |
- | mso-fareast-font-family: | + | |
- | mso-fareast-theme-font: | + | |
- | mso-hansi-font-family: | + | |
- | mso-hansi-theme-font: | + | |
- | mso-bidi-font-family:" | + | |
- | mso-bidi-theme-font: | + | |
- | mso-fareast-language: | + | |
- | span.berschrift1Zchn | + | |
- | {mso-style-name:" | + | |
- | mso-style-priority: | + | |
- | mso-style-unhide: | + | |
- | mso-style-locked: | + | |
- | mso-style-link:" | + | |
- | mso-ansi-font-size: | + | |
- | mso-bidi-font-size: | + | |
- | font-family:" | + | |
- | mso-ascii-font-family: | + | |
- | mso-ascii-theme-font: | + | |
- | mso-fareast-font-family:" | + | |
- | mso-fareast-theme-font: | + | |
- | mso-hansi-font-family: | + | |
- | mso-hansi-theme-font: | + | |
- | mso-bidi-font-family:" | + | |
- | mso-bidi-theme-font: | + | |
- | color:# | + | |
- | mso-themecolor: | + | |
- | mso-themeshade: | + | |
- | font-weight: | + | |
- | span.MTEquationSection | + | |
- | {mso-style-name: | + | |
- | mso-style-unhide: | + | |
- | color: | + | |
- | display: | + | |
- | mso-hide: | + | |
- | mso-ansi-language: | + | |
- | p.MTDisplayEquation, | + | |
- | {mso-style-name: | + | |
- | mso-style-unhide: | + | |
- | mso-style-link:" | + | |
- | mso-style-next: | + | |
- | margin-top: | + | |
- | margin-right: | + | |
- | margin-bottom: | + | |
- | margin-left: | + | |
- | line-height: | + | |
- | mso-pagination: | + | |
- | tab-stops: | + | |
- | font-size: | + | |
- | font-family:" | + | |
- | mso-ascii-font-family: | + | |
- | mso-ascii-theme-font: | + | |
- | mso-fareast-font-family: | + | |
- | mso-fareast-theme-font: | + | |
- | mso-hansi-font-family: | + | |
- | mso-hansi-theme-font: | + | |
- | mso-bidi-font-family:" | + | |
- | mso-bidi-theme-font: | + | |
- | mso-ansi-language: | + | |
- | mso-fareast-language: | + | |
- | span.MTDisplayEquationZchn | + | |
- | {mso-style-name:" | + | |
- | mso-style-unhide: | + | |
- | mso-style-locked: | + | |
- | mso-style-link: | + | |
- | mso-ansi-language: | + | |
- | span.berschrift2Zchn | + | |
- | {mso-style-name:" | + | |
- | mso-style-priority: | + | |
- | mso-style-unhide: | + | |
- | mso-style-locked: | + | |
- | mso-style-link:" | + | |
- | mso-ansi-font-size: | + | |
- | mso-bidi-font-size: | + | |
- | font-family:" | + | |
- | mso-ascii-font-family: | + | |
- | mso-ascii-theme-font: | + | |
- | mso-fareast-font-family:" | + | |
- | mso-fareast-theme-font: | + | |
- | mso-hansi-font-family: | + | |
- | mso-hansi-theme-font: | + | |
- | mso-bidi-font-family:" | + | |
- | mso-bidi-theme-font: | + | |
- | color:# | + | |
- | mso-themecolor: | + | |
- | font-weight: | + | |
- | span.berschrift3Zchn | + | |
- | {mso-style-name:" | + | |
- | mso-style-priority: | + | |
- | mso-style-unhide: | + | |
- | mso-style-locked: | + | |
- | mso-style-link:" | + | |
- | font-family:" | + | |
- | mso-ascii-font-family: | + | |
- | mso-ascii-theme-font: | + | |
- | mso-fareast-font-family:" | + | |
- | mso-fareast-theme-font: | + | |
- | mso-hansi-font-family: | + | |
- | mso-hansi-theme-font: | + | |
- | mso-bidi-font-family:" | + | |
- | mso-bidi-theme-font: | + | |
- | color:# | + | |
- | mso-themecolor: | + | |
- | font-weight: | + | |
- | span.FunotentextZchn | + | |
- | {mso-style-name:" | + | |
- | mso-style-noshow: | + | |
- | mso-style-priority: | + | |
- | mso-style-unhide: | + | |
- | mso-style-locked: | + | |
- | mso-style-link: | + | |
- | mso-ansi-font-size: | + | |
- | mso-bidi-font-size: | + | |
- | span.SprechblasentextZchn | + | |
- | {mso-style-name:" | + | |
- | mso-style-noshow: | + | |
- | mso-style-priority: | + | |
- | mso-style-unhide: | + | |
- | mso-style-locked: | + | |
- | mso-style-link: | + | |
- | mso-ansi-font-size: | + | |
- | mso-bidi-font-size: | + | |
- | font-family:" | + | |
- | mso-ascii-font-family: | + | |
- | mso-hansi-font-family: | + | |
- | mso-bidi-font-family: | + | |
- | span.SpellE | + | |
- | {mso-style-name:""; | + | |
- | mso-spl-e: | + | |
- | span.GramE | + | |
- | {mso-style-name:""; | + | |
- | mso-gram-e: | + | |
- | .MsoChpDefault | + | |
- | {mso-style-type: | + | |
- | mso-default-props: | + | |
- | font-family:" | + | |
- | mso-ascii-font-family: | + | |
- | mso-ascii-theme-font: | + | |
- | mso-fareast-font-family: | + | |
- | mso-fareast-theme-font: | + | |
- | mso-hansi-font-family: | + | |
- | mso-hansi-theme-font: | + | |
- | mso-bidi-font-family:" | + | |
- | mso-bidi-theme-font: | + | |
- | mso-fareast-language: | + | |
- | .MsoPapDefault | + | |
- | {mso-style-type: | + | |
- | margin-bottom: | + | |
- | line-height: | + | |
- | /* Page Definitions */ | + | |
- | | + | |
- | {mso-footnote-separator: | + | |
- | mso-footnote-continuation-separator: | + | |
- | mso-endnote-separator: | + | |
- | mso-endnote-continuation-separator: | + | |
- | @page WordSection1 | + | |
- | {size: | + | |
- | margin: | + | |
- | mso-header-margin: | + | |
- | mso-footer-margin: | + | |
- | mso-paper-source: | + | |
- | div.WordSection1 | + | |
- | {page: | + | |
- | /* List Definitions */ | + | |
- | @list l0 | + | |
- | {mso-list-id: | + | |
- | mso-list-type: | + | |
- | mso-list-template-ids: | + | |
- | @list l0:level1 | + | |
- | {mso-level-start-at: | + | |
- | mso-level-number-format: | + | |
- | mso-level-text: | + | |
- | mso-level-tab-stop: | + | |
- | mso-level-number-position: | + | |
- | margin-left: | + | |
- | text-indent: | + | |
- | font-family:" | + | |
- | mso-fareast-font-family: | + | |
- | mso-fareast-theme-font: | + | |
- | mso-bidi-font-family:" | + | |
- | mso-bidi-theme-font: | + | |
- | @list l0:level2 | + | |
- | {mso-level-number-format: | + | |
- | mso-level-text: | + | |
- | mso-level-tab-stop: | + | |
- | mso-level-number-position: | + | |
- | margin-left: | + | |
- | text-indent: | + | |
- | font-family:" | + | |
- | @list l0:level3 | + | |
- | {mso-level-number-format: | + | |
- | mso-level-text: | + | |
- | mso-level-tab-stop: | + | |
- | mso-level-number-position: | + | |
- | margin-left: | + | |
- | text-indent: | + | |
- | font-family: | + | |
- | @list l0:level4 | + | |
- | {mso-level-number-format: | + | |
- | mso-level-text: | + | |
- | mso-level-tab-stop: | + | |
- | mso-level-number-position: | + | |
- | margin-left: | + | |
- | text-indent: | + | |
- | font-family: | + | |
- | @list l0:level5 | + | |
- | {mso-level-number-format: | + | |
- | mso-level-text: | + | |
- | mso-level-tab-stop: | + | |
- | mso-level-number-position: | + | |
- | margin-left: | + | |
- | text-indent: | + | |
- | font-family:" | + | |
- | @list l0:level6 | + | |
- | {mso-level-number-format: | + | |
- | mso-level-text: | + | |
- | mso-level-tab-stop: | + | |
- | mso-level-number-position: | + | |
- | margin-left: | + | |
- | text-indent: | + | |
- | font-family: | + | |
- | @list l0:level7 | + | |
- | {mso-level-number-format: | + | |
- | mso-level-text: | + | |
- | mso-level-tab-stop: | + | |
- | mso-level-number-position: | + | |
- | margin-left: | + | |
- | text-indent: | + | |
- | font-family: | + | |
- | @list l0:level8 | + | |
- | {mso-level-number-format: | + | |
- | mso-level-text: | + | |
- | mso-level-tab-stop: | + | |
- | mso-level-number-position: | + | |
- | margin-left: | + | |
- | text-indent: | + | |
- | font-family:" | + | |
- | @list l0:level9 | + | |
- | {mso-level-number-format: | + | |
- | mso-level-text: | + | |
- | mso-level-tab-stop: | + | |
- | mso-level-number-position: | + | |
- | margin-left: | + | |
- | text-indent: | + | |
- | font-family: | + | |
- | @list l1 | + | |
- | {mso-list-id: | + | |
- | mso-list-type: | + | |
- | mso-list-template-ids: | + | |
- | @list l1:level1 | + | |
- | {mso-level-start-at: | + | |
- | mso-level-number-format: | + | |
- | mso-level-text: | + | |
- | mso-level-tab-stop: | + | |
- | mso-level-number-position: | + | |
- | margin-left: | + | |
- | text-indent: | + | |
- | font-family:" | + | |
- | mso-fareast-font-family: | + | |
- | mso-fareast-theme-font: | + | |
- | mso-bidi-font-family:" | + | |
- | mso-bidi-theme-font: | + | |
- | @list l1:level2 | + | |
- | {mso-level-number-format: | + | |
- | mso-level-text: | + | |
- | mso-level-tab-stop: | + | |
- | mso-level-number-position: | + | |
- | margin-left: | + | |
- | text-indent: | + | |
- | font-family:" | + | |
- | @list l1:level3 | + | |
- | {mso-level-number-format: | + | |
- | mso-level-text: | + | |
- | mso-level-tab-stop: | + | |
- | mso-level-number-position: | + | |
- | margin-left: | + | |
- | text-indent: | + | |
- | font-family: | + | |
- | @list l1:level4 | + | |
- | {mso-level-number-format: | + | |
- | mso-level-text: | + | |
- | mso-level-tab-stop: | + | |
- | mso-level-number-position: | + | |
- | margin-left: | + | |
- | text-indent: | + | |
- | font-family: | + | |
- | @list l1:level5 | + | |
- | {mso-level-number-format: | + | |
- | mso-level-text: | + | |
- | mso-level-tab-stop: | + | |
- | mso-level-number-position: | + | |
- | margin-left: | + | |
- | text-indent: | + | |
- | font-family:" | + | |
- | @list l1:level6 | + | |
- | {mso-level-number-format: | + | |
- | mso-level-text: | + | |
- | mso-level-tab-stop: | + | |
- | mso-level-number-position: | + | |
- | margin-left: | + | |
- | text-indent: | + | |
- | font-family: | + | |
- | @list l1:level7 | + | |
- | {mso-level-number-format: | + | |
- | mso-level-text: | + | |
- | mso-level-tab-stop: | + | |
- | mso-level-number-position: | + | |
- | margin-left: | + | |
- | text-indent: | + | |
- | font-family: | + | |
- | @list l1:level8 | + | |
- | {mso-level-number-format: | + | |
- | mso-level-text: | + | |
- | mso-level-tab-stop: | + | |
- | mso-level-number-position: | + | |
- | margin-left: | + | |
- | text-indent: | + | |
- | font-family:" | + | |
- | @list l1:level9 | + | |
- | {mso-level-number-format: | + | |
- | mso-level-text: | + | |
- | mso-level-tab-stop: | + | |
- | mso-level-number-position: | + | |
- | margin-left: | + | |
- | text-indent: | + | |
- | font-family: | + | |
- | @list l2 | + | |
- | {mso-list-id: | + | |
- | mso-list-type: | + | |
- | mso-list-template-ids: | + | |
- | @list l2:level1 | + | |
- | {mso-level-start-at: | + | |
- | mso-level-number-format: | + | |
- | mso-level-text: | + | |
- | mso-level-tab-stop: | + | |
- | mso-level-number-position: | + | |
- | text-indent: | + | |
- | font-family:" | + | |
- | mso-fareast-font-family: | + | |
- | mso-fareast-theme-font: | + | |
- | mso-bidi-font-family:" | + | |
- | mso-bidi-theme-font: | + | |
- | @list l2:level2 | + | |
- | {mso-level-number-format: | + | |
- | mso-level-text: | + | |
- | mso-level-tab-stop: | + | |
- | mso-level-number-position: | + | |
- | text-indent: | + | |
- | font-family:" | + | |
- | @list l2:level3 | + | |
- | {mso-level-number-format: | + | |
- | mso-level-text: | + | |
- | mso-level-tab-stop: | + | |
- | mso-level-number-position: | + | |
- | text-indent: | + | |
- | font-family: | + | |
- | @list l2:level4 | + | |
- | {mso-level-number-format: | + | |
- | mso-level-text: | + | |
- | mso-level-tab-stop: | + | |
- | mso-level-number-position: | + | |
- | text-indent: | + | |
- | font-family: | + | |
- | @list l2:level5 | + | |
- | {mso-level-number-format: | + | |
- | mso-level-text: | + | |
- | mso-level-tab-stop: | + | |
- | mso-level-number-position: | + | |
- | text-indent: | + | |
- | font-family:" | + | |
- | @list l2:level6 | + | |
- | {mso-level-number-format: | + | |
- | mso-level-text: | + | |
- | mso-level-tab-stop: | + | |
- | mso-level-number-position: | + | |
- | text-indent: | + | |
- | font-family: | + | |
- | @list l2:level7 | + | |
- | {mso-level-number-format: | + | |
- | mso-level-text: | + | |
- | mso-level-tab-stop: | + | |
- | mso-level-number-position: | + | |
- | text-indent: | + | |
- | font-family: | + | |
- | @list l2:level8 | + | |
- | {mso-level-number-format: | + | |
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- | ol | + | |
- | {margin-bottom: | + | |
- | ul | + | |
- | {margin-bottom: | + | |
- | --> | + | |
- | </ | + | |
- | <!--[if gte mso 10]> | + | |
- | < | + | |
- | /* Style Definitions */ | + | |
- | | + | |
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- | mso-fareast-language: | + | |
- | </ | + | |
- | < | + | |
- | < | + | |
- | </ | + | |
- | < | + | |
- | <o:idmap v:ext=" | + | |
- | </ | + | |
- | </ | + | |
- | <body lang=DE style=' | + | |
+ | The documentation is structured as follows. Sections 1.2-1.3 give an overview of CAPRI system and its main software, GAMS. Section 1.4 informs about the CAPRI network. Sections 1.5 and 1.6 describe historical development of the model and more recent examples of CAPRI studies. Chapter 2 provides with system requirements and the main installation instructions. | ||
- | <div class=WordSection1> | + | The rest of the document largely follows the workflow of the model: the different steps of building up the national, regional and global data base provide the foundations on which the system rests (Chapter 3). Subsequently the procedure needed to establish a baseline (Chapter 4) is discussed. Chapter 5 deals with the scenario impact analysis, giving descriptions for the regional supply models as well as for the global market model and their interactions in scenario runs. Chapter 6 covers some elements of post model analysis, whereas Chapter 7 covers options for spatial downscaling of the NUTS2 results. At the very end (Chapter 8), some developer tools for stability analysis are described. |
- | <h1 style=' | ||
- | style=' | ||
- | style=' | ||
- | class=MTEquationSection>< | ||
- | lang=EN-GB style=' | ||
- | SEQ MTEqn \r \h \* MERGEFORMAT <span style=' | ||
- | style=' | ||
- | style=' | ||
- | style=' | ||
- | style=' | ||
- | style=' | ||
- | lang=EN-GB style=' | ||
- | lang=EN-GB style=' | ||
- | in Agriculture – Generating more economic sophisticated solutions< | ||
- | style=' | ||
- | class=MsoFootnoteReference>< | ||
- | class=MsoFootnoteReference>< | ||
- | lang=EN-GB style=' | ||
- | mso-ascii-theme-font: | ||
- | mso-fareast-theme-font: | ||
- | mso-bidi-font-family:" | ||
- | color:# | ||
- | mso-fareast-language: | ||
- | <h2 style=' | + | ===== What is CAPRI ===== |
- | guide as training material< | + | |
- | name=" | + | The Common Agricultural Policy Regional Impact (CAPRI) model is a global partial equilibrium model for the agricultural sector, with a focus on the European Union. It has been designed for ex-ante impact assessment of agricultural, |
- | style=' | + | |
- | class=MsoFootnoteReference>< | + | |
- | lang=EN-GB style=' | + | |
- | mso-ascii-theme-font: | + | |
- | mso-fareast-theme-font: | + | |
- | mso-bidi-font-family:" | + | |
- | color:# | + | |
- | EN-US; | + | |
- | <p class=MsoNormal>< | + | ==== Figure 1. General structure of the CAPRI model ==== |
- | reading material should guide you theoretically through the derivation of | + | |
- | parameter calibration of PMP terms for economically more sophisticated | + | |
- | programming models. In this <span class=GramE> | + | |
- | understand how a linear programming works and what the shortcomings are, how | + | |
- | positive mathematical programming models are calibrated and how these different | + | |
- | models behave if input parameters change.< | + | |
- | <p class=MsoNormal>< | + | {{ capri_model_fig01.png | Figure |
- | there is a hands on excel (Session_B5_Beginners_Advanced_PMP_example.xlsx) and | + | Source: Own illustration |
- | GAMS file (Session_B5_Advanced_PMP_example.gms) for the beginners and advanced, | + | |
- | respectively.< | + | |
- | title="">< | + | |
- | footnote'>< | + | |
- | lang=EN-GB style=' | + | |
- | mso-ascii-theme-font: | + | |
- | minor-latin; | + | |
- | mso-bidi-theme-font: | + | |
- | EN-US; | + | |
- | With the examples provided in the files you can train how to set up and solve a | + | |
- | linear programming model, calibrate the positive mathematical programming | + | |
- | models and simulate the price changes. You are free to also define other price | + | |
- | changes once you are familiar with the price scenarios given here in the guide.< | + | |
- | + | ||
- | <h2 style=' | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | models is strongly related to the decision making situation of a farmer. | + | |
- | Farmers must make decisions about the production plan. The decisions are not | + | |
- | independent from physical or financial constraints. Traditionally, | + | |
- | relied on intuition, experience or their neighbour’s actions. Using formal | + | |
- | methods like mathematical programming models can enhance the farmers profits, | + | |
- | at least when the production program becomes more complex. Those mathematical | + | |
- | programming models predict quite accurately the behaviour of a representative | + | |
- | farmer. This predictive “power” makes those representative farm models useful | + | |
- | for policy analysis (Hazell & Norton, 1986).< | + | |
- | + | ||
- | <h2 style=' | + | |
- | linear programming model < | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | method to find the profit maximizing combination of production activities which | + | |
- | is feasible subject to a set of farm constraints. <span style=' | + | |
- | 1'> | + | |
- | + | ||
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- | alternative production activities, their unit of measurement, | + | |
- | requirements and any production constraints< | + | |
- | + | ||
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- | auto; | + | |
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- | + | ||
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- | margins of the production activities< | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | programming model for a farm is presented (Hazell & Norton, 1986). < | + | |
- | + | ||
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- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | activity levels. The dual variables of the resource constraints (<span | + | |
- | style=' | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | values give the maximum value a representative farmer is willing to pay to | + | |
- | enhance the resource constraints. For instance, the shadow price of land is the | + | |
- | maximum value of one additional unit of land to increase the most profitable | + | |
- | production activity.< | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | few assumptions are made. At first, an optimization problem <span class=GramE> | + | |
- | faced</ | + | |
- | lang=EN-GB style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | MERGEFORMAT <span style=' | + | |
- | style=' | + | |
- | lang=EN-GB style=' | + | |
- | lang=EN-GB style=' | + | |
- | It is important to have at least one nonzero constraint </ | + | |
- | lang=EN-GB style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | MERGEFORMAT <span style=' | + | |
- | style=' | + | |
- | lang=EN-GB style=' | + | |
- | lang=EN-GB style=' | + | |
- | number of production activities </ | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | MERGEFORMAT <span style=' | + | |
- | style=' | + | |
- | lang=EN-GB style=' | + | |
- | lang=EN-GB style=' | + | |
- | can be find. The model coefficients – gross <span class=GramE> | + | |
- | style=' | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | top: | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | resource available <span style=' | + | |
- | -5.0pt'>< | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | known and constant. This also leads to the fact, that the increase of total | + | |
- | expected gross margin and the resource requirements per unit are proportional | + | |
- | to the used production activity level and hence, independent of the activity | + | |
- | level used. Further it is assumed, that the resources can be used and the | + | |
- | activities produced in quantities are fractional units. The units of the | + | |
- | resources or activities are identical. No interaction effects between the | + | |
- | production activities are allowed, which means, that the total product is the | + | |
- | sum of their individual products. < | + | |
- | + | ||
- | <h3 style=' | + | |
- | small example< | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | style=' | + | |
- | programming model to become familiar with mathematical programming models.< | + | |
- | + | ||
- | <p class=MsoCaption style=' | + | |
- | name=" | + | |
- | style=' | + | |
- | style=' | + | |
- | EN-GB'>< | + | |
- | style=' | + | |
- | style=' | + | |
- | EN-GB'>< | + | |
- | style=' | + | |
- | style=' | + | |
- | EN-GB'> | + | |
- | file sheet “Simple LP”, GAMS file model “LP”)< | + | |
- | + | ||
- | <table class=MsoTableGrid border=1 cellspacing=0 cellpadding=0 | + | |
- | | + | |
- | | + | |
- | < | + | |
- | <td width=164 nowrap valign=top style=' | + | |
- | mso-border-alt: | + | |
- | <td width=278 nowrap colspan=4 valign=top style=' | + | |
- | border-left: | + | |
- | solid windowtext .5pt; | + | |
- | <p class=MsoNormal align=center style=' | + | |
- | margin-bottom: | + | |
- | line-height: | + | |
- | style=' | + | |
- | </ | + | |
- | <td width=32 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | solid windowtext .5pt; | + | |
- | <td width=134 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | solid windowtext .5pt; | + | |
- | </ | + | |
- | < | + | |
- | <td width=164 nowrap valign=top style=' | + | |
- | border-top: | + | |
- | padding:0cm 5.4pt 0cm 5.4pt; | + | |
- | <td width=76 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <p class=MsoNormal align=center style=' | + | |
- | margin-bottom: | + | |
- | line-height: | + | |
- | style=' | + | |
- | </ | + | |
- | <td width=67 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <p class=MsoNormal align=center style=' | + | |
- | margin-bottom: | + | |
- | line-height: | + | |
- | style=' | + | |
- | </ | + | |
- | <td width=59 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <p class=MsoNormal align=center style=' | + | |
- | margin-bottom: | + | |
- | line-height: | + | |
- | style=' | + | |
- | </ | + | |
- | <td width=75 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <p class=MsoNormal align=center style=' | + | |
- | margin-bottom: | + | |
- | line-height: | + | |
- | style=' | + | |
- | </ | + | |
- | <td width=32 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <td width=134 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | </ | + | |
- | < | + | |
- | <td width=164 nowrap valign=top style=' | + | |
- | border-top: | + | |
- | padding:0cm 5.4pt 0cm 5.4pt; | + | |
- | <p class=MsoNormal style=' | + | |
- | margin-left: | + | |
- | style=' | + | |
- | mso-ansi-language: | + | |
- | </ | + | |
- | <td width=76 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <td width=67 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <td width=59 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <td width=75 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <td width=32 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
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- | <td width=134 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | </ | + | |
- | < | + | |
- | <td width=164 nowrap valign=top style=' | + | |
- | border-top: | + | |
- | padding:0cm 5.4pt 0cm 5.4pt; | + | |
- | <p class=MsoNormal style=' | + | |
- | margin-left: | + | |
- | lang=EN-GB style=' | + | |
- | margin (pesos)< | + | |
- | </ | + | |
- | <td width=76 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <p class=MsoNormal align=center style=' | + | |
- | margin-bottom: | + | |
- | line-height: | + | |
- | EN-GB'> | + | |
- | </ | + | |
- | <td width=67 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <p class=MsoNormal align=center style=' | + | |
- | margin-bottom: | + | |
- | line-height: | + | |
- | EN-GB'> | + | |
- | </ | + | |
- | <td width=59 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <p class=MsoNormal align=center style=' | + | |
- | margin-bottom: | + | |
- | line-height: | + | |
- | EN-GB'> | + | |
- | </ | + | |
- | <td width=75 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <p class=MsoNormal align=center style=' | + | |
- | margin-bottom: | + | |
- | line-height: | + | |
- | EN-GB'> | + | |
- | </ | + | |
- | <td width=32 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <td width=134 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <p class=MsoNormal style=' | + | |
- | margin-left: | + | |
- | style=' | + | |
- | mso-ansi-language: | + | |
- | </ | + | |
- | </ | + | |
- | < | + | |
- | <td width=164 nowrap valign=top style=' | + | |
- | border-top: | + | |
- | padding:0cm 5.4pt 0cm 5.4pt; | + | |
- | <p class=MsoNormal style=' | + | |
- | margin-left: | + | |
- | style=' | + | |
- | mso-ansi-language: | + | |
- | </ | + | |
- | <td width=76 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <td width=67 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <td width=59 nowrap valign=top style=' | + | |
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- | border-left: | + | |
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- | mso-border-alt: | + | |
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- | mso-border-alt: | + | |
- | <td width=134 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | </ | + | |
- | < | + | |
- | <td width=164 nowrap valign=top style=' | + | |
- | border-top: | + | |
- | padding:0cm 5.4pt 0cm 5.4pt; | + | |
- | <p class=MsoNormal style=' | + | |
- | margin-left: | + | |
- | lang=EN-GB style=' | + | |
- | </ | + | |
- | <td width=76 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <p class=MsoNormal align=center style=' | + | |
- | margin-bottom: | + | |
- | line-height: | + | |
- | EN-GB'> | + | |
- | </ | + | |
- | <td width=67 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <p class=MsoNormal align=center style=' | + | |
- | margin-bottom: | + | |
- | line-height: | + | |
- | EN-GB'> | + | |
- | </ | + | |
- | <td width=59 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <p class=MsoNormal align=center style=' | + | |
- | margin-bottom: | + | |
- | line-height: | + | |
- | EN-GB'> | + | |
- | </ | + | |
- | <td width=75 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <p class=MsoNormal align=center style=' | + | |
- | margin-bottom: | + | |
- | line-height: | + | |
- | EN-GB'> | + | |
- | </ | + | |
- | <td width=32 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <p class=MsoNormal style=' | + | |
- | margin-left: | + | |
- | lang=EN-GB style=' | + | |
- | </ | + | |
- | <td width=134 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <p class=MsoNormal style=' | + | |
- | margin-left: | + | |
- | lang=EN-GB style=' | + | |
- | </ | + | |
- | </ | + | |
- | < | + | |
- | <td width=164 nowrap valign=top style=' | + | |
- | border-top: | + | |
- | padding:0cm 5.4pt 0cm 5.4pt; | + | |
- | <p class=MsoNormal style=' | + | |
- | margin-left: | + | |
- | class=SpellE>< | + | |
- | lang=EN-GB style=' | + | |
- | </ | + | |
- | <td width=76 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <p class=MsoNormal align=center style=' | + | |
- | margin-bottom: | + | |
- | line-height: | + | |
- | EN-GB'> | + | |
- | </ | + | |
- | <td width=67 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <p class=MsoNormal align=center style=' | + | |
- | margin-bottom: | + | |
- | line-height: | + | |
- | EN-GB'> | + | |
- | </ | + | |
- | <td width=59 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <p class=MsoNormal align=center style=' | + | |
- | margin-bottom: | + | |
- | line-height: | + | |
- | EN-GB'> | + | |
- | </ | + | |
- | <td width=75 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <p class=MsoNormal align=center style=' | + | |
- | margin-bottom: | + | |
- | line-height: | + | |
- | EN-GB'> | + | |
- | </ | + | |
- | <td width=32 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <p class=MsoNormal style=' | + | |
- | margin-left: | + | |
- | lang=EN-GB style=' | + | |
- | </ | + | |
- | <td width=134 nowrap valign=top style=' | + | |
- | border-left: | + | |
- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
- | <p class=MsoNormal style=' | + | |
- | margin-left: | + | |
- | lang=EN-GB style=' | + | |
- | </ | + | |
- | </ | + | |
- | </ | + | |
- | + | ||
- | <p class=MsoCaption style=' | + | |
- | style=' | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | lang=EN-GB style=' | + | |
- | yes'> | + | |
- | < | + | |
- | </ | + | |
- | style=' | + | |
- | lang=EN-GB style=' | + | |
- | class=GramE> | + | |
- | has to set the level of four production activities that produce four | + | |
- | commodities. The objective function is to maximize the expected total gross | + | |
- | margin. But at the same time the resource constraints must hold. In particular, | + | |
- | at maximum 200 ha of land are available for each production activity and 10,000 | + | |
- | hours of labour. Each production activity has the same requirement to the land. | + | |
- | This means, one ha of land produces one unit of the commodity. The production | + | |
- | activities need different amounts of labour. For example, production activity 4 | + | |
- | needs 87 hours of labour to produce one unit of commodity four. This activity | + | |
- | has also the greatest expected gross margin of 516 per unit. The combination of | + | |
- | the production activities that maximizes the total gross margin and that does | + | |
- | not violate the constraints has to be find.< | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | solver in Excel. The expected total gross margin <span style=' | + | |
- | top: | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | class=GramE> | + | |
- | -5.0pt'>< | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | style=' | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | labour with <span style=' | + | |
- | | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | solver of Excel gives the solution of <span style=' | + | |
- | top: | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | class=GramE> | + | |
- | relative; | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | resources of land and labour are totally exhausted. The farmer is advised to | + | |
- | only use production activity two and four to maximize his profits. The shadow | + | |
- | price of land is 391.5 and labour is 1.43. For instance, the representative | + | |
- | farmer would pay 391.5 for one additional unit of land to enhance his | + | |
- | production level for one of his preferred production activities.< | + | |
- | + | ||
- | <h3 style=' | + | |
- | of the example< | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | implementation of the linear programming model to set up a profit maximizing | + | |
- | farm production plan. The representative farmer has the knowledge about the | + | |
- | expected gross margins and resource requirements of each production activity | + | |
- | and with that, the linear programming model is a useful tool to calculate the | + | |
- | profit maximizing production plan.<a style=' | + | |
- | name=" | + | |
- | style=' | + | |
- | class=MsoFootnoteReference>< | + | |
- | 115%; | + | |
- | mso-fareast-font-family: | + | |
- | minor-latin; | + | |
- | mso-ansi-language: | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | activities are part of the production problem. But in reality we observe that | + | |
- | farmers also use production activities that seem to be less profitable. The | + | |
- | linear programming model obviously does not consider real farmer’s behaviour | + | |
- | and produces overspecialisation. There can be several reasons why farmers use | + | |
- | less profitable production activities. One the one hand there are governmental | + | |
- | rules or production activity rotation requirements that force the farmer to set | + | |
- | up a less profitable production plan. This could be handled by additional | + | |
- | constraints. Further reasons for this behaviour can be the risk aversion of the | + | |
- | farmer or some costs that the farmer faces for some production activities that | + | |
- | cannot be observed and with that not be implemented with additional | + | |
- | constraints. Additionally, | + | |
- | programming model will increase the problem of overspecialisation.< | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | costs for the farmer should be the point we want to investigate in the | + | |
- | following. The linear programming model is extended and the solution of the | + | |
- | optimization programme should be more realistic when compared to real world | + | |
- | behaviour.< | + | |
- | + | ||
- | <h2 style=' | + | |
- | mathematical programming model < | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | overspecialisation and to reflect more realistic behaviour of farmers, positive | + | |
- | mathematical programming is a methodology that calibrates programming models to | + | |
- | observed quantities to specify appropriate non-linear objective functions | + | |
- | (Heckelei, 2002).<a style=' | + | |
- | title="">< | + | |
- | footnote'>< | + | |
- | lang=EN-GB style=' | + | |
- | mso-ascii-theme-font: | + | |
- | minor-latin; | + | |
- | mso-bidi-theme-font: | + | |
- | EN-US; | + | |
- | These objective functions are modifications of the traditional objective | + | |
- | function used in linear programming models and have terms that can be | + | |
- | interpreted to capture the unobserved behaviour of the farmer and hence, should | + | |
- | lead to more realistic optimization solutions.< | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | programming approach can be separated into three steps (Howitt, 1995). At | + | |
- | first, the optimization model is forced to reproduce observed activity levels. | + | |
- | Second, the dual values of the calibration constraints are used for the | + | |
- | modification of the objective function. Third, the new model is employed for | + | |
- | simulations.< | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | model builds on the basis of the linear programming model and is extended only | + | |
- | by additional constraints. These are the calibration constraints:< | + | |
- | + | ||
- | <p class=MTDisplayEquation style=' | + | |
- | lang=EN-GB>< | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | SEQ MTSec \c \* Arabic \* MERGEFORMAT <span style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | lang=EN-GB>< | + | |
- | lang=EN-GB>< | + | |
- | lang=EN-GB>< | + | |
- | style=' | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | + | ||
- | <p class=MsoListParagraphCxSpFirst style=' | + | |
- | auto; | + | |
- | lang=EN-GB style=' | + | |
- | mso-hansi-font-family: | + | |
- | EN-GB'>< | + | |
- | </ | + | |
- | style=' | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | production activity levels< | + | |
- | + | ||
- | <p class=MsoListParagraphCxSpMiddle style=' | + | |
- | auto; | + | |
- | lang=EN-GB style=' | + | |
- | mso-hansi-font-family: | + | |
- | EN-GB'>< | + | |
- | </ | + | |
- | style=' | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | + | ||
- | <p class=MsoListParagraphCxSpLast style=' | + | |
- | text-align: | + | |
- | lang=EN-GB style=' | + | |
- | mso-hansi-font-family: | + | |
- | EN-GB'>< | + | |
- | </ | + | |
- | style=' | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | associated with the calibration constraints< | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | lang=EN-GB style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | MERGEFORMAT <span style=' | + | |
- | style=' | + | |
- | lang=EN-GB style=' | + | |
- | lang=EN-GB style=' | + | |
- | lang=EN-GB style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | MERGEFORMAT <span style=' | + | |
- | style=' | + | |
- | lang=EN-GB style=' | + | |
- | lang=EN-GB style=' | + | |
- | lang=EN-GB style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | MERGEFORMAT <span style=' | + | |
- | style=' | + | |
- | lang=EN-GB style=' | + | |
- | lang=EN-GB style=' | + | |
- | lang=EN-GB style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | MERGEFORMAT <span style=' | + | |
- | style=' | + | |
- | lang=EN-GB style=' | + | |
- | lang=EN-GB style=' | + | |
- | programming model. In the first step, the optimal solution of this positive | + | |
- | mathematical programme <span class=GramE> | + | |
- | the observed production activity levels (<span style=' | + | |
- | top: | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | lang=EN-GB style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | MERGEFORMAT <span style=' | + | |
- | style=' | + | |
- | lang=EN-GB style=' | + | |
- | lang=EN-GB style=' | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | distinguished into preferable and marginal activities. Preferable production | + | |
- | activities (<span style=' | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | marginal activities < | + | |
- | (<span style=' | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | of the calibration constraints are zero for the marginal activities (<span | + | |
- | style=' | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | cost for preferable activities (<span style=' | + | |
- | mso-text-raise: | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | the objective function entries and the coefficients of the marginal activities | + | |
- | (& | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | resources only depend on the marginal activities, interaction between the | + | |
- | production activities are not covered. With the dual values of the calibration | + | |
- | constraints, | + | |
- | model is captured.< | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | mathematical programming approach the dual values of the preferable activities | + | |
- | (<span style=' | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | function. The extension of the former objective function of the linear | + | |
- | programming model implies a variable cost function which leads to the omission | + | |
- | of the calibration constraints of the mathematical programming model in the | + | |
- | first step.< | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | parameters of a variable cost function such that the economic rule marginal | + | |
- | revenue equals marginal cost holds at observed activity levels. Most often, a | + | |
- | quadratic cost function is used.< | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | function can be specified like:< | + | |
- | + | ||
- | <p class=MTDisplayEquation style=' | + | |
- | lang=EN-GB>< | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | SEQ MTSec \c \* Arabic \* MERGEFORMAT <span style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | lang=EN-GB>< | + | |
- | lang=EN-GB>< | + | |
- | style=' | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | + | ||
- | <p class=MsoListParagraphCxSpFirst style=' | + | |
- | auto; | + | |
- | lang=EN-GB style=' | + | |
- | mso-hansi-font-family: | + | |
- | EN-GB'>< | + | |
- | </ | + | |
- | style=' | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | the linear cost term< | + | |
- | + | ||
- | <p class=MsoListParagraphCxSpLast style=' | + | |
- | text-align: | + | |
- | lang=EN-GB style=' | + | |
- | mso-hansi-font-family: | + | |
- | EN-GB'>< | + | |
- | </ | + | |
- | style=' | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | the quadratic cost term< | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | (<span style=' | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | style=' | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | + | ||
- | <p class=MTDisplayEquation style=' | + | |
- | lang=EN-GB>< | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | SEQ MTSec \c \* Arabic \* MERGEFORMAT <span style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | lang=EN-GB>< | + | |
- | lang=EN-GB>< | + | |
- | style=' | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | + | ||
- | <p class=MsoListParagraph style=' | + | |
- | text-align: | + | |
- | lang=EN-GB style=' | + | |
- | mso-hansi-font-family: | + | |
- | EN-GB'>< | + | |
- | </ | + | |
- | style=' | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | of the production activity< | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | top: | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | <span class=GramE> | + | |
- | margin and the price of the production activity: <span style=' | + | |
- | top: | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | style=' | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | consider the opportunity cost of the fixed resources. But the resource | + | |
- | constraints of the complete model count for this.< | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | two contains the quadratic cost function in the objective function:< | + | |
- | + | ||
- | <p class=MTDisplayEquation style=' | + | |
- | lang=EN-GB>< | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | SEQ MTSec \c \* Arabic \* MERGEFORMAT <span style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | lang=EN-GB>< | + | |
- | lang=EN-GB>< | + | |
- | style=' | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | style=' | + | |
- | lang=EN-GB style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | MERGEFORMAT <span style=' | + | |
- | style=' | + | |
- | lang=EN-GB style=' | + | |
- | lang=EN-GB style=' | + | |
- | lang=EN-GB style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | MERGEFORMAT <span style=' | + | |
- | style=' | + | |
- | lang=EN-GB style=' | + | |
- | lang=EN-GB style=' | + | |
- | The dual values of </ | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | MERGEFORMAT <span style=' | + | |
- | style=' | + | |
- | lang=EN-GB style=' | + | |
- | lang=EN-GB style=' | + | |
- | solution of the linear programming model.< | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | style=' | + | |
- | function that satisfy the conditions to calibrate to observed activity levels | + | |
- | when solving the positive mathematical programming model are infinite. But the | + | |
- | different combinations of parameters lead to different response behaviour to | + | |
- | changing economic conditions (see Heckelei (2002) for technical proof).< | + | |
- | + | ||
- | <h3 style=' | + | |
- | the parameters of the new objective function< | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | style=' | + | |
- | parameters of the new objective function.< | + | |
- | href="# | + | |
- | style=' | + | |
- | class=MsoFootnoteReference>< | + | |
- | 115%; | + | |
- | mso-fareast-font-family: | + | |
- | minor-latin; | + | |
- | mso-ansi-language: | + | |
- | Some of them are presented in the following (Heckelei, 2002). Here we present | + | |
- | only a few. In the CAPRI training course we will elaborate additional | + | |
- | specification rules.< | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | style=' | + | |
- | very simply ((e.g. Howitt and Mean, 1983; <span class=SpellE> | + | |
- | Paris, 1995)). Just setting <span style=' | + | |
- | mso-text-raise: | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | off-diagonal elements of <span style=' | + | |
- | -6.0pt'>< | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | elements as:< | + | |
- | + | ||
- | <p class=MTDisplayEquation style=' | + | |
- | lang=EN-GB>< | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | SEQ MTSec \c \* Arabic \* MERGEFORMAT <span style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | lang=EN-GB>< | + | |
- | lang=EN-GB>< | + | |
- | style=' | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | style=' | + | |
- | top: | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | the marginal activities are zero. The objective function of that specification | + | |
- | rule would be:< | + | |
- | + | ||
- | <p class=MTDisplayEquation style=' | + | |
- | lang=EN-GB>< | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | SEQ MTSec \c \* Arabic \* MERGEFORMAT <span style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | lang=EN-GB>< | + | |
- | lang=EN-GB>< | + | |
- | lang=EN-GB>< | + | |
- | style=' | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | style=' | + | |
- | function with another rule. He set <span style=' | + | |
- | mso-text-raise: | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | off-diagonal elements <span class=GramE> | + | |
- | top: | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | + | ||
- | <p class=MTDisplayEquation style=' | + | |
- | lang=EN-GB>< | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | SEQ MTSec \c \* Arabic \* MERGEFORMAT <span style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | lang=EN-GB>< | + | |
- | lang=EN-GB>< | + | |
- | style=' | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | the marginal activities are not zero as before and the new objective function | + | |
- | would be:< | + | |
- | + | ||
- | <p class=MTDisplayEquation style=' | + | |
- | lang=EN-GB>< | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | SEQ MTSec \c \* Arabic \* MERGEFORMAT <span style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | lang=EN-GB>< | + | |
- | lang=EN-GB>< | + | |
- | lang=EN-GB>< | + | |
- | style=' | + | |
- | | + | |
- | < | + | |
- | o: | + | |
- | </ | + | |
- | < | + | |
- | DrawAspect=" | + | |
- | </ | + | |
- | </ | + | |
- | + | ||
- | <h3 style=' | + | |
- | the positive mathematical programming approach < | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | style=' | + | |
- | new objective function in the positive mathematical programming | + | |
- | applied and the results are presented regarding the parameters of the cost | + | |
- | functions.< | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | lang=EN-US style=' | + | |
- | yes'> | + | |
- | < | + | |
- | </ | + | |
- | style=' | + | |
- | lang=EN-GB style=' | + | |
- | a positive mathematical programming model. It is quite the same as in the | + | |
- | linear programming model of </ | + | |
- | style=' | + | |
- | style=' | + | |
- | style=' | + | |
- | lang=EN-GB style=' | + | |
- | yes'> | + | |
- | < | + | |
- | </ | + | |
- | style=' | + | |
- | lang=EN-GB style=' | + | |
- | it is convenient to split the gross margin into price and cost per unit of a | + | |
- | level of production activity. Second – and this is important for the positive | + | |
- | mathematical programming approach – the addition of 4 calibration constraints. | + | |
- | The model is forced to solve this optimization problem to have the observed | + | |
- | production activity levels (x1=55; x2=30; x3=85 and x4=30) recalibrated. <span | + | |
- | style=' | + | |
- | + | ||
- | <p class=MsoCaption style=' | + | |
- | name=" | + | |
- | style=' | + | |
- | style=' | + | |
- | EN-US'>< | + | |
- | style=' | + | |
- | style=' | + | |
- | lang=EN-US style=' | + | |
- | style=' | + | |
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- | programming models are intended to do. < | + | |
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- | behaviour of the two examples regarding prices changes< | + | |
- | + | ||
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- | programming model as well as the two positive mathematical programming models | + | |
- | simulation behaviour regarding price changes. Therefore, we change the prices | + | |
- | and solve the optimization problems of all three models and compare how | + | |
- | different the models react.< | + | |
- | + | ||
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- | of the commodities of the production activities. Only p1 and p3 are increasing, | + | |
- | p2 and p4 are remaining constant. Price p1 increases with 40 units and price p3 | + | |
- | with 60 units with each scenario step.< | + | |
- | + | ||
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- | solved again with the different sets of prices. For the linear programming | + | |
- | model, the most profitable levels of production activities for each price | + | |
- | scenario depict </ | + | |
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- | the first two price scenarios no adaption of the production programme of the | + | |
- | representative farmer is profitable. For the other two price scenarios the | + | |
- | optimal production were changed to x3=123.3 and x4= 76.7 for scenario 3 and | + | |
- | x3=200 for scenario 4.< | + | |
- | + | ||
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- | production activities of the linear programming model activities (Excel file | + | |
- | sheet “Simple LP”, GAMS file model “LP”)< | + | |
- | + | ||
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- | MERGEFORMAT <span style=' | + | |
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- | the production activities x1, x2, and x4 are declining whereas the level of | + | |
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- | MERGEFORMAT <span style=' | + | |
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- | the level of the production activity x3 is increasing. This is also due to the | + | |
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- | other production activities with every new price scenario.< | + | |
- | + | ||
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- | production activities of the mathematical programming model with objective | + | |
- | function </ | + | |
- | EN-US'>< | + | |
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- | + | ||
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- | mso-border-top-alt: | + | |
- | mso-border-alt: | + | |
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- | text-align: | + | |
- | </ | + | |
- | <td width=" | + | |
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- | + | ||
- | <p class=MsoCaption style=' | + | |
- | style=' | + | |
- | + | ||
- | <h3 style=' | + | |
- | of simulation< | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | style=' | + | |
- | differences between the linear and the positive mathematical programming | + | |
- | approaches. The reaction of the linear programming model to price changes shows | + | |
- | erratic adaptions of the production programme induced by price changes. It | + | |
- | takes a while until the production programme changes when the model is optimized. | + | |
- | These changes are also very strong. This means that between the second and | + | |
- | third price scenario the production programme differs completely and the fourth | + | |
- | price scenario induce a production plan with only one production activity. This | + | |
- | behaviour seems very unlikely in reality.< | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | style=' | + | |
- | lang=EN-GB style=' | + | |
- | GOTOBUTTON ZEqnNum923545< | + | |
- | style=' | + | |
- | ZEqnNum923545 \* Charformat \! \* MERGEFORMAT <span style=' | + | |
- | style=' | + | |
- | lang=EN-GB style=' | + | |
- | lang=EN-GB style=' | + | |
- | programming approach shows a smoother reaction to price changes compared to the | + | |
- | linear programming model. But it can be seen that the adaption of the | + | |
- | production programme is still relatively erratic. But the reaction to price | + | |
- | changes seems to be much more likely than in the linear programming model.< | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | style=' | + | |
- | lang=EN-GB style=' | + | |
- | GOTOBUTTON ZEqnNum279523< | + | |
- | style=' | + | |
- | style=' | + | |
- | <span style=' | + | |
- | field-end'></ | + | |
- | style=' | + | |
- | lang=EN-GB style=' | + | |
- | sophisticated reaction to price changes compared to the other simulated models. | + | |
- | The adaption of the production plan induced by price changes is very smooth and | + | |
- | is much more realistic. There is no overspecialisation and overreaction like in | + | |
- | the other two models.< | + | |
- | + | ||
- | <h2 style=' | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | style=' | + | |
- | linear farm production model and the extension based on the positive | + | |
- | mathematical programming approach to be able to produce more realistic production | + | |
- | plans when it comes to profit maximization. The positive mathematical | + | |
- | programming approach calibrates a programming model to observed production | + | |
- | behaviour. This is achieved with calibration constraints and the dual values of | + | |
- | the calibration constraints are used to specify a new objective function that | + | |
- | reflects observed farm behaviour that cannot be captured with additional | + | |
- | constraints. These new objective functions capture a lot of possible <span | + | |
- | class=SpellE> | + | |
- | technology, risk behaviour or other non-linear constraints.< | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | style=' | + | |
- | specifications of cost functions. There a many ways to specify these functions | + | |
- | and each of them imply different behaviour to changing economic circumstances. | + | |
- | Additionally to the specifications shown in this paper there are others as | + | |
- | well. The average-cost-approach (Heckelei, 2002) or the use of exogenous supply | + | |
- | elasticities (Heckelei, 2002; empirically applied by Helming et al., 2001) are | + | |
- | some of them, which will elaborated in the CAPRI training course in Seville. | + | |
- | You can also have a closer look at them in the Excel file sheet “PMP2” and | + | |
- | “PMP4” as well as in the GAMS file models “Howitt_12” and “Elasticities1”, | + | |
- | respectively.< | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | style=' | + | |
- | objective functions are not unproblematic. As these procedures capture the | + | |
- | observed behaviour, a change in economic incentives of the farmer(s) over time inducing | + | |
- | other behaviour is not observed and must come from other sources. Other | + | |
- | shortcomings of these approaches of positive mathematical programming models can | + | |
- | be found in the literature (see Heckelei (2002) for an overview).< | + | |
- | + | ||
- | <h2 style=' | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | class=SpellE>< | + | |
- | lang=EN-GB style=' | + | |
- | mathematical programming model for regional analysis of agricultural policies. | + | |
- | In: <span class=SpellE> | + | |
- | Agricultural Economics and Policies, EAAE, Proceedings of the 40th Seminar, | + | |
- | 26.-28. <span class=SpellE> | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | (1986): Mathematical Programming for Economic Analysis in Agriculture, | + | |
- | Macmillan Publishing Company.< | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | estimation of programming models for agricultural supply analysis. <span | + | |
- | class=SpellE> | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | class=SpellE> | + | |
- | of Environmental Policy Scenarios in Flemish Agriculture. In: Heckelei, T., | + | |
- | Witzke, H.P. and <span class=SpellE> | + | |
- | Sector Modelling and Policy Information Systems. Proceedings of the 65 <span | + | |
- | class=SpellE>< | + | |
- | at Bonn University, <span class=SpellE> | + | |
- | Kiel, pp. 237-245. < | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | Mathematical Programming< | + | |
- | Journal of Agricultural Economics</ | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | Approach to Microeconomic Programming Models. Working Paper (6). Department of | + | |
- | Agricultural Economics, University of California, Davis. < | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | lang=EN-GB style=' | + | |
- | Parametric Programming and Comparative Statics. Chapter 11 in Notes <span | + | |
- | class=GramE> | + | |
- | of California, Davis. < | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | (2001): Analyse der Produktions- und Einkommenseffekte von | + | |
- | Agrarumwelt-programmen unter Verwendung einer weiterentwickelten Form der | + | |
- | Positiv Quadratischen Programmierung. <span lang=EN-GB style=' | + | |
- | EN-GB'> | + | |
- | + | ||
- | <p class=MsoNormal style=' | + | |
- | class=SpellE>< | + | |
- | lang=EN-GB style=' | + | |
- | Production Models using Positive Mathematical Programming. An | + | |
- | Agro-environmental Policy Analysis in Southwest Germany. Shaker Verlag, Aachen. | + | |
- | < | + | |
- | + | ||
- | </ | + | |
- | + | ||
- | <div style=' | + | |
- | + | ||
- | <hr align=left size=1 width=" | + | |
- | + | ||
- | < | + | |
- | + | ||
- | <div style=' | + | |
- | + | ||
- | <p class=MsoFootnoteText>< | + | |
- | name=" | + | |
- | footnote'>< | + | |
- | style=' | + | |
- | mso-ascii-theme-font: | + | |
- | minor-latin; | + | |
- | mso-bidi-theme-font: | + | |
- | mso-bidi-language: | + | |
- | lang=EN-GB style=' | + | |
- | Thünen Institute of Farm Economics< | + | |
- | + | ||
- | </ | + | |
- | + | ||
- | <div style=' | + | |
- | + | ||
- | <p class=MsoFootnoteText>< | + | |
- | name=" | + | |
- | footnote'>< | + | |
- | style=' | + | |
- | mso-ascii-theme-font: | + | |
- | minor-latin; | + | |
- | mso-bidi-theme-font: | + | |
- | mso-bidi-language: | + | |
- | style=' | + | |
- | GAMS file are already completely working. But you must be familiar how to user | + | |
- | the solver in excel and how to run a GAMS file. Be careful how to set all the | + | |
- | constraints to get the desired behaviour of the models!< | + | |
- | + | ||
- | </ | + | |
- | + | ||
- | <div style=' | + | |
- | + | ||
- | <p class=MsoFootnoteText>< | + | |
- | name=" | + | |
- | footnote'>< | + | |
- | style=' | + | |
- | mso-ascii-theme-font: | + | |
- | minor-latin; | + | |
- | mso-bidi-theme-font: | + | |
- | mso-bidi-language: | + | |
- | style=' | + | |
- | “solver” add-in in the options.< | + | |
- | + | ||
- | </ | + | |
- | + | ||
- | <div style=' | + | |
- | + | ||
- | <p class=MsoFootnoteText>< | + | |
- | name=" | + | |
- | style=' | + | |
- | class=MsoFootnoteReference>< | + | |
- | 115%; | + | |
- | mso-fareast-font-family: | + | |
- | minor-latin; | + | |
- | mso-ansi-language: | + | |
- | lang=EN-GB style=' | + | |
- | model is an optimization model, in which an objective function is maximized or | + | |
- | minimized subject to some constraints. In our case we have a maximization | + | |
- | problem which is also called the primal model. The total gross margin is | + | |
- | maximized while land and labour use are constrained. This problem can be | + | |
- | transformed into a minimization problem (dual model), in which land and labour | + | |
- | use has to be minimized while the total gross margins of each activity are | + | |
- | constrained to have a certain minimum. The maximum value of the objective | + | |
- | function of the primal model is always the same like the value of the objective | + | |
- | function of the dual model. See Hazell & Norton (1986) for a more detailed | + | |
- | presentation.< | + | |
- | + | ||
- | </ | + | |
- | + | ||
- | <div style=' | + | |
- | + | ||
- | <p class=MsoFootnoteText>< | + | |
- | name=" | + | |
- | footnote'>< | + | |
- | style=' | + | |
- | mso-ascii-theme-font: | + | |
- | minor-latin; | + | |
- | mso-bidi-theme-font: | + | |
- | mso-bidi-language: | + | |
- | style=' | + | |
- | EN-GB'> | + | |
- | + | ||
- | </ | + | |
- | + | ||
- | <div style=' | + | |
- | + | ||
- | <p class=MsoFootnoteText>< | + | |
- | name=" | + | |
- | footnote'>< | + | |
- | style=' | + | |
- | mso-ascii-theme-font: | + | |
- | minor-latin; | + | |
- | mso-bidi-theme-font: | + | |
- | mso-bidi-language: | + | |
- | lang=EN-GB style=' | + | |
- | (1999) or <span class=SpellE> | + | |
- | + | ||
- | </ | + | |
- | + | ||
- | <div style=' | + | |
- | + | ||
- | <p class=MsoFootnoteText>< | + | |
- | name=" | + | |
- | footnote'>< | + | |
- | style=' | + | |
- | mso-ascii-theme-font: | + | |
- | minor-latin; | + | |
- | mso-bidi-theme-font: | + | |
- | mso-bidi-language: | + | |
- | style=' | + | |
- | used for optimization and an optimal solution is found, you have to choose the | + | |
- | “sensitivity analysis report” to extract the dual values of the calibration | + | |
- | constraints. In the GAMS file you can see that after a model is solved, the | + | |
- | dual values are captured as follows: <span class=GramE> | + | |
- | class=SpellE> | + | |
- | + | ||
- | </ | + | |
- | + | ||
- | <div style=' | + | |
- | + | ||
- | <p class=MsoFootnoteText>< | + | |
- | name=" | + | |
- | footnote'>< | + | |
- | style=' | + | |
- | mso-ascii-theme-font: | + | |
- | minor-latin; | + | |
- | mso-bidi-theme-font: | + | |
- | mso-bidi-language: | + | |
- | lang=EN-US style=' | + | |
- | even higher compared to the other production activities.< | + | |
- | + | ||
- | </ | + | |
- | + | ||
- | </ | + | |
- | + | ||
- | </ | + | |
- | + | ||
- | </ | + | |
start.txt · Last modified: 2022/11/07 10:23 by 127.0.0.1