Which of these natural product retailers was founded first and helped pioneer the mainstream market for organic foods in the United States?

The natural products industry has transformed from small health food stores to a multi-billion dollar market segment. Companies focusing on organic, sustainable, and environmentally friendly products have shaped new retail strategies and consumer expectations. Test your knowledge about one of the pioneering brands that helped establish natural products as mainstream retail offerings.

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Whole Foods Market (1980)
Trader Joe's (1984)
Sprouts Farmers Market (2002)
Natural Grocers (1998)