Over much of the past 30 years, Whole Foods Market co-founder John Mackey enjoyed wild success selling organic groceries to the masses. That brought media buzz, fast growth, and high profit margins to his grocery chain. It's also attracted imitators. Now, with the likes of Kroger and Wal-Mart Stores muscling into everything from organic milk to sustainably raised salmon, Mackey finds himself fending off challenges from bigger rivals intent on eating Whole Foods' lunch.
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