Rob Walton, chairman of Wal-Mart Stores Inc. and son of founder Sam Walton, appears on stage during the annual shareholder meeting in Fayetteville, Arkansas, U.S., on Friday, June 3, 2011. Wal-Mart Stores Inc. renewed plans to buy back as much as $15 billion of its shares, potentially bolstering the Walton family's control of the world's largest retailer. Photographer: Beth Hall/Bloomberg via Getty Images
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