(BusinessWeek) Five years ago, the world’s largest retail chain didn’t have to worry much about the world’s largest online mall. Only about a quarter of Wal-Mart Stores (WMT) customers shopped at Amazon.com (AMZN), according to data from researcher Kantar Retail. Today, however, half of Wal-Mart customers say they’ve shopped at both merchants. That’s leaving the mega-retailer—which long ago bested local brick-and-mortar merchandise stores and supermarkets across America—with a massive online competitor that is too tough to ignore.
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