http://www.marketskeptics.com/2009/12/2010-food-crisis-for-dummies.html Long read but seems to make sense and is well documented. From the essay: ". . . It is absolutely key to understand that the production of agricultural goods is a fixed, once a year cycle (or twice a year in the case of double crops). The wheat, corn, soybeans and other food staples are harvested in the fall/spring and then that is it for production. It doesn’t matter how high prices go or how desperate people get, no new supply can be brought online until the next harvest at the earliest. The supply must last until the next harvest, which is why it is critical that food is correctly priced to avoid overconsumption, otherwise food shortages occur. "The USDA—by manufacturing the data needed to keep supply and demand in balance—has ensured that agricultural commodities are incorrectly priced, which has lead to overconsumption and has guaranteed disaster next year when supplies run out. . . ."