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An employee pushes a cart as he processes a customer order ahead of shipping at one of Amazon.com Inc.'s fulfillment centers in Rugeley, U.K., on Monday, Dec. 2, 2013. Online retailers in the U.K. are anticipating their busiest day as shoppers flush with end-of-month pay-checks seek Christmas deals on the Web. Photographer: Simon Dawson/Bloomberg via Getty ImagesBloomberg—Bloomberg via Getty Images