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Amazon Flex Won't Outmuscle UPS, FedEx

At this point, it may seem that there's no industry that Amazon.com (AMZN) can't touch, so it's not surprise that logistics are worried that the e-commerce giant could turn from friend to foe for delivery companies like United Parcel Service (UPS) and FedEx (FDX). Crowdsourcing "will remain a marginal source of capacity for the e-retail industry," as there's limited risk of "full-scare diversion" of shipping from traditional carriers to crowdsourced models, simply because of the constraints and high costs required to build efficient, flexible networks and the limitations of "right-timed" labor.