POLYSYS is a modular economic simulation modeling system of the U.S. agriculture sector in which planning decisions are made at the Agricultural Statistics District (ASD) level and crop demands and market prices are solved at the national level. The integrated livestock sector is also solved at the national level. Fourteen crops are included in the modeling system: corn, grain sorghum, oats, barley, wheat, soybeans, cotton, rice, peanuts, sugar cane, sugar beets, dry beans, alfalfa hay, and other hay. Five livestock commodities are also endogenous to the system, including beef, pork, broilers, turkeys, and milk. POLYSYS simulations are anchored to a baseline of projections such as those estimated by FAPRI, the U.S. Department of Agriculture or the Congressional Budget Office.

Several publications about the POLYSYS model and applications using POLYSYS are available as pdf files online for you to view and download.

POLYSYS Oveview

The POLYSYS Modeling Framework: An Overview

The POLYSYS Modeling Framework: A Documentation

• Chapter 1: Introduction
• Chapter 2: Conceptual Structure
• Chapter 3: Operational Structure
• Chapter 4: Developing a Regional Baseline
• Chapter 5: Livestock Module
• Chapter 6: Crop Supply Module
• Chapter 7: Crop Demand Module
• Chapter 8: Income Module
• Appendix A: Derivation of EDM Reduced Form Solutions
• Appendix B: POLYSYS Variables
• Appendix C: POLYSYS Production Regions

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