There's no question that Amazon (NASDAQ: AMZN) has changed the game in retail.

With a commitment to wide selection, fast delivery, and free returns, the company has made online shopping automatic for many Americans and still dominates e-commerce with close to 50% market share.

It's now the second-biggest company in the world by revenue just behind Walmart, but the e-commerce giant has long struggled to penetrate one of the largest categories in the retail industry: groceries.

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Source Fool.com