The freighter American Mariner discharges its load of iron ore in Cleveland last November. Prices for iron ore and other commodities have plunged amid economic uncertainty in China and Europe. Mark Duncan/AP hide caption

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A driver operates a haul truck in the Ray Mine near Kearny, Ariz. Falling copper prices have residents of some small mining towns in Arizona worried as shrinking revenues bring layoffs. Christopher Deahr/FlickrVision hide caption

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Meat is displayed in a case at a grocery store in Miami. The index of retail prices for meats, poultry, fish and eggs was up 7.7 percent from a year ago — more than triple the overall inflation rate. Joe Raedle/Getty Images hide caption

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