Reviews economic models, especially treatment of competition, marketing practices, and international trade effects on U.S. cattle prices and producers' incomes.

Extract: The number of beef cows in each of the four major U.S. cow-calf production regions declined by about one-fifth between 1975 and 1980 in response to sha

Types of economic deforestation models. Household and firm-level models. Regional-level models. National and macro-level models. Priority areas for future resea