In this Thursday, April 12, 2012, photo, fruit are displayed at a vendors stand at the Italian Market, in Philadelphia. A steep drop in gasoline costs drove down a measure of U.S. wholesale prices in May by the most since July 2009. But outside the food and energy categories, prices increased moderately. The producer price index fell 1 percent in May, after dropping 0.2 percent in April, the Labor Department reported Wednesday, June 13, 2012. (AP Photo/Matt Rourke)

Associated Press
In this Thursday, April 12, 2012, photo, fruit are displayed at a vendors stand at the Italian Market, in Philadelphia. A steep drop in gasoline costs drove down a measure of U.S. wholesale prices in May by the most since July 2009. But outside the food and energy categories, prices increased moderately. The producer price index fell 1 percent in May, after dropping 0.2 percent in April, the Labor Department reported Wednesday, June 13, 2012. (AP Photo/Matt Rourke)
In this Thursday, April 12, 2012, photo, fruit are displayed at a vendors stand at the Italian Market, in Philadelphia. A steep drop in gasoline costs drove down a measure of U.S. wholesale prices in May by the most since July 2009. But outside the food and energy categories, prices increased moderately. The producer price index fell 1 percent in May, after dropping 0.2 percent in April, the Labor Department reported Wednesday, June 13, 2012. (AP Photo/Matt Rourke)
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