Price Determination for Corn and Wheat: The Role of Market Factors and Government Programs
by Paul Westcott and Linwood Hoffman
Technical Bulletin No. (TB-1878) 30 pp, August 1999
Annual models for U.S. farm prices for corn and wheat are developed based on market factors as well as government agricultural commodity programs. The pricing relationships utilize a stocks-to-use modeling framework to capture the effects of market supply and demand factors on price determination. This formulation is augmented by factors that represent the changing role of agricultural policies, particularly government price support and stockholding programs. For wheat, international market effects as well as wheat feed use and related cross-commodity pricing considerations also are included. Model properties and model performance measures are presented. Additionally, recent price-forecasting applications of the models are discussed. The relatively simple structure of the estimated price models and their small data requirements lend themselves to use in price-forecasting applications in conjunction with market analysis of supply and demand conditions. In particular, the models have been implemented into USDA’s short-term market analysis and long-term baseline projections. In these applications, the models provide an analytical framework to forecast prices and a vehicle for making consistency checks among the Department's supply, demand, and price forecasts.
Keywords: Corn, wheat, farm price, price determination, stocks-to-use ratio, price supports, commodity programs, forecasts
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