Tough Times at Walmart

(CNN) It's not going to be a good year for Walmart.

Shares of the nation's largest retailer tumbled about 5% in early trading after the company lowered its full-year sales forecast. The company also posted a drop in fourth-quarter and full-year earnings, although both came in better than expected by Wall Street. The problem: Walmart is closing stores and taking a hit from the strong dollar.

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