"What is the effect of U.S. agricultural support programs on land, input use, and production in agriculture?" U.S. agricultural support programs have a greater effect on land and other farm inputs than on commodity production. Commodity programs have Increased land values and encouraged the substitution of other Inputs such as farm chemicals for land. Agricultural support programs raise total farm income, but in their absence, commodity production would decline, prices would rise, and the mix of crops would change as program crop producers shift to other crops.