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Welcome to the BATModules Wiki! Here you can find documentation of the modules developed in the BATModel project to enhance the modelling of agri-food trade policies. If you know what you are looking for you can directly access the documentation through the links in the sidebar. Else you can browse through the table below which provides a short description of the objective of each module, with links to the associated documentation and code.
| Module | Objective | Doc. | Code |
|---|---|---|---|
| Regional environmental impact | A top-down link from a GTAP-based CGE model to CAPRI. The CGE model provides price changes and CAPRI computes regional agricultural supply responses and derives environmental regional environmental impacts. | Wiki | GAMS |
| Remove self-trade from a GTAP database | The standard GTAP data aggregation procedure joins regional endowments while keeping within-region trade separate. This is conceptually inconsistent and complicates analysis of trade impacts as well as tracing direct and indirect impacts through global value chains. The self-trade removal module can be included in the data preparation process, moving self-trade that appears when aggregating countries or regions to domestic supply. The resulting database will have zero trade within model regions, simplifying international trade analysis to trade between model regions. | Wiki | GEMPACK |
| Material flows and footprints | Driven by the SDGs and climate agreements economic models are increasingly used for integrated assessments where biophysical impacts (like GHG emission, land use) are assessed alongside economic indicators. Especially when linking an economic model to a biophysical model it is important to be clear on the extent to which the monetary-based estimates satisfy material balance constraints. This module derives consistent regionalized material balances from a standard GTAP v7 style database by stripping taxes and margins from commodity flows. From these material balances the Leontief Inverse matrix is derived which traces produced commodities to final demand through global value chains. Combining the tracing with production characteristics like physical production levels, land use etc. multi-dimensional footprints of final demand can be computed. These footprint measures allow forward looking life-cycle (LCA) assessments. | Wiki | GEMPACK |
| Spatial Price Equilibrium | This module defines a spatial price equilibrium module to use as alternative trade theory in models with bilateral trade flows, such as Armington CES-based models. The module replaces the usual equations that define import shares in relation to price ratios by the first-order conditions of spatial price equilibrium, i.e. for each trade link, import price is at most as high as export price plus trade costs, and if there is a trade flow then the previously stated condition holds with equality. Moreover, trade costs are assumed to increase in trade volume of each flow, providing an easy way of calibrating the trade flows to almost any observed pattern of trade and price differences. | Wiki | GAMS |
| Armington with commitment term | This module defines a Armington with commitment term module to use as alternative trade theory in models with bilateral trade flows, such as Armington CES-based models. This module allows to overcome the 'small share stays small' problem with standard CES trade modelling. | Wiki | GAMS |
