text: Regulation of markets and government subsidies to promote corn to ethanol conversion have distorted the existing economic allocation by diverting food to energy use. This raised equilibrium prices, increased energy supply by a small fraction (US corn ethanol accounted for less than 1% of US energy consumption in 2009 and reduced grain for food by a much larger one (US corn used for ethanol production is 4.3% of the total world grain production, even after allowing for the feed byproduct.