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Costco continues to hold its own against Amazon

Costco shopping carts

Shares in Costco rose in after-hours trading, following the company's announcement of better-than-expected profits, combined with its 14th-straight month of same-store sales growth.

Costco's secret sauce is a mix of low prices, well-trained staff, and an ever-changing, but limited assortment of products, which have all kept Americans flocking to Costco outlets when other retailers have lost business to the Internet.