FILE-In this Wednesday, May 9, 2012, file photo, David Lee holds on to his carts while shopping at a Costco Wholesale in Portland, Ore. 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. (AP Photo/Rick Bowmer, File)

Associated Press
FILE-In this Wednesday, May 9, 2012, file photo, David Lee holds on to his carts while shopping at a Costco Wholesale in Portland, Ore. 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. (AP Photo/Rick Bowmer, File)
FILE-In this Wednesday, May 9, 2012, file photo, David Lee holds on to his carts while shopping at a Costco Wholesale in Portland, Ore. 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. (AP Photo/Rick Bowmer, File)
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