The U.S. Postal Service has leverage to negotiate higher delivery rates for Amazon. Amazon is its largest customer, but that's because Amazon must rely on it for deliveries to low-margin and rural addresses.
A comment on "The Postal Service is subsidizing Jeff Bezos' quest to turn Amazon into a delivery machine that competes with UPS and FedEx -- but USPS can't break up with Bezos" (R. Premack).
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