Amazon has agreed to buy Whole Foods in a roughly $13.5 billion deal. It would be Amazon’s biggest acquisition to date, and it’s generating headlines such as “earth shaking.” Whole Foods has been underperforming a little lately. Its growth has slowed and activist investors have been after the chain to sell itself. But what’s a digital retailer like Amazon want with all those old-school brick-and-mortar stores? And can it turn things around at Whole Foods? 

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