Is Wal-Mart Stock Peaking?

After years of disappointing investors, shares of the discount chain have jumped to a four-year high. But are they now too pricey?

For years, Warren Buffett's investment in Wal-Mart (WMT) looked like a blunder. The legendary investor and chief executive of Berkshire Hathaway (BRKA) bought almost 20 million shares in the world's largest retailer in 2005 and spent three years watching that $944 million investment go almost nowhere.

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