Farm-level commodity prices are far more volatile than food prices, as costs for marketing inputs such as packaging, processing, and transportation mitigate commodity price volatility on supermarket shelves and restaurant menus. Corn, wheat, and soybeans are the three most important field crops to the U.S. food supply. The average farm price of these crops, weighted by total production, regularly rises or falls by over 10 percent from year to year. On average, food prices have become less volatile in recent decades, as food price inflation averaged 8 percent per year in the 1970s, but only 2.8 percent per year since 1990. Commodity prices, alternatively, have grown somewhat more volatile over time. However, large changes in major commodity prices have relatively small impacts on food prices. In 2007-08, the average production-weighted price of these crops increased by 50 percent, while food prices rose 5.5 percent. Similarly, in 2010-11, the crop prices rose 31 percent and food prices increased 3.7 percent. This chart appears in the Food Price Outlook topic page on the ERS website, updated April 17, 2013.
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