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 The University of Tennessee | Institute of Agriculture

Tennessee Rural Economic Development


A national, interregional, agricultural model

The Policy Analysis System (POLYSYS) is a dynamic stochastic (in yields) model of the US agricultural sector, capable of estimating the competitive allocation of agricultural land and crop prices associated with changes in yield and management practices.  Input requirements include a baseline solution typically from USDA, and policy or resource changes desired for a particular scenario. Output includes economic variables such as County‐level crop supply, national crop demands and prices, National livestock supply and demand, Farm income, and land use including forest harvest, afforestation, and pasture conversion.  In addition, through the environmental module, estimates of changes in carbon emission and sequestration, soil erosion and sediment, fertilizer use, and chemical use are provided.

Data and Uses of The POLYSYS Modeling System

Presented by Daniel De La Torre Ugarte








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Department of Agricultural and Resource Economics

Dr. Burton C. English
2621 Morgan Circle
308C Morgan Hall
Knoxville, TN 37996-4518
Phone: 865-974-3716
Fax: 865.974.4829