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It was an unusual time for me to be at Costco, Sunday morning, and as feared, it was jammed, the checkout lines long and carts overflowing. But this store, with packers assisting cashiers, is usually efficient at speeding people through and I reached for my eBook reader to make the most of the wait.

Out of the corner of my eye, I spotted somebody approaching me with a Costco badge and tablet. He offered to pre-scan my items and then when I presented my card to the cashier I could immediately pay, without even unloading and reloading the cart.

“You guys are amazing,” I said with a smile of assent. “I have my moments,” he replied. “But yes, Costco is ama

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