Operations Inside An Amazon.com Inc. Fulfillment Center On Cyber Monday [Getty Images]

Kiva Systems LLC robots move shelves to fill orders at the Amazon.com Inc. fulfillment center on Cyber Monday in Tracy, California, U.S., on Monday, Dec. 1, 2014. Internet holiday shopping rose 8.7 percent on Cyber Monday, slowing from the same time frame last year as consumers spread their online purchases over more days. Photographer: David Paul Morris/Bloomberg via Getty Images

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