Corn is the major agricultural input used in the United States to produce ethanol, which has accounted for 35-40 percent of U.S. corn use in recent years. Rapid expansion of ethanol production in the past decade reflected a response to high crude oil prices, the Renewable Fuel Standard, and other factors. However, ethanol production has plateaued as oil prices have fallen and the gasoline market has hit a 10-percent blend constraint.
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