Insight: How U.S. retailers are building up their online muscle

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Associate Joseph Rodeheaver fills clothing orders at the Macy's-Bloomingdale's fulfillment center in Martinsburg, West Virginia in this December 6, 2012 file photograph. Macy's Inc recently opened a facility the size of 43 football fields - big enough to stock 1 million pairs of shoes - just to fulfill orders made online. REUTERS/Gary Cameron/Files