A look at how Amazon Prime has compelled Target, Walmart, and many Google Express vendors to offer "free" two-day shipping and the challenges in matching Amazon (Christopher Mims/Wall Street Journal)

Christopher Mims / Wall Street Journal:
A look at how Amazon Prime has compelled Target, Walmart, and many Google Express vendors to offer “free” two-day shipping and the challenges in matching Amazon  —  The quest to offer fast, free delivery has triggered an arms race among the largest retailers

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