Americans are spending less time in Walmart and Target, but they still linger in Costco. Here's why.

Tech Insider
A Costco shopping cart is shown at a Costco Wholesale store in Carlsbad, California in this file photo taken September 11, 2013. REUTERS/Mike Blake
Welcome to Costco. You're probably gonna be here a while (or longer than your Target run, on average).

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