UNITED STATES - NOVEMBER 03: A corn cob is photographed during harvest in Yankton County, South Dakota, U.S., on Monday, Nov. 3, 2008. Corn fell to the lowest in more than a week on speculation that slumping equity and energy markets signal weakening economic growth and slower demand for commodities, including grain-based livestock feed and biofuels. (Photo by Aaron Packard/Bloomberg via Getty Images)
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