What's Driving Food Prices?, July 2008: "Understanding the complex and multiple factors influencing food prices today is important as future policy options are debated, according to a new study released today by Farm Foundation...Written by Purdue University economists Wallace Tyner, Christopher Hurt and Philip Abbott, the study identifies three broad sets of forces driving food price increases: global changes in production and consumption of key commodities, the depreciation of the U.S. dollar, and growth in the production of biofuels."