More than anyone else, Costco Wholesale (NASDAQ:COST) and Amazon (NASDAQ:AMZN)have dominated the current retail era. Costco has regularly put up comparable sales growth in the mid- to high-single-digit range and is the second-largest American retailer by revenue, while Amazon’s fast-growing e-commerce business has threatened nearly every corner of traditional retail.

The two companies have managed to grow and take market share when so many other retailers are struggling, largely because of the…

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