An employee pushes a cart past rows of storage aisles as he processes customer orders 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 Images
