Buoyed by the improving economy and Americans’ belief that they can eat themselves healthy, sales of organic food are booming again. The growth in sales of organic products in the U.S., food and nonfood, had slowed to 4.6 percent in 2009 but has since rebounded. Sales rose 11.5 percent in 2013, to $35 billion, according to the Organic Trade Association.

Once sold primarily in musty natural foods shops, organics went wide after Whole Foods Market (WFM) took over the high end of the market, earning the nickname “Whole Paycheck” in the process. In recent years the mainstream has discovered more natural foods, and big chains, including Kroger (KR) and Safeway (SWY) have piled in. Sales of organic products at Costco (COST) have doubled in two years to about $3 billion a year.

Now the organics industry is bracing for its next big shakeup. Wal-Mart Stores (WMT), the nation’s largest grocer, is expanding its selection of organic foods. And it’s promising to sell the stuff at the same prices it sells nonorganic food.

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