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These are Excel files containing versions of the Heckscher-Ohlin (i.e., Factor Proportions) trade model that you can manipulate yourself to see how the parameters of the model cause equilibrium, and the diagrams representing it, to change. They were created by John Gilbert at Utah State University.
Most of the figures are like what we have used in class, including the unit-value-isoquent (Lerner) diagram, the production (Edgeworth) box, and the output-space equilibrium (PPF) diagram.
In all models you can change the endowments of capital and/or labor, their cost shares in the X and Y industries representing factor intensities (the production functions are Cobb-Douglas), technology shift parameters, and the expenditure shares in consumption representing preferences (also Cobb-Douglas). The Single Economy model represents a small-open economy for which prices are given, and you can specify these as well. The Dual Economy models depict a world of two countries with technologies, preferences, and factor endowments that are initially identical but can be changed. The Model with Trade Policy, in a separate file, is a small open economy in which you can also specify a tariff or subsidy on international trade.