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One of his main contentions is that Amazon is ripping off the U.S. Postal Service, but it's not clear whether it is getting the short end of the stick from the Jeff Bezos-led retailing juggernaut.
In fact, Amazon may be saving the post office from financial ruin.
It's true that the post office is losing money. It reported a $2.7 billion net loss in 2017.
But the post office is not funded by U.S. tax dollars.
And when you look at the revenue breakdown, you can see that shipping and packages is actually one of the few categories that brought in more money than the previous year. While overall revenue fell $1.8 billion, shipping and packages saw a $2.1 billion increase in revenue. Meanwhile, first-class mail revenue was down around $1.8 billion.
And the post office was in the red long before Amazon became such an online giant. The USPS began to lose money in the early 2000s with the internet's rise. But one of the post office's biggest revenue drainers has nothing to do with shipments, or the Internet.
It's all about employee benefits.
In a note to clients on Tuesday, Baird Equity Research said that any large customer, including Amazon, would actually help the post office subsidize its pension costs.
In October 2013, Amazon struck a five-year deal with the post office. The specific terms of the contract aren't available to the public because the post office's deals with private shippers are considered proprietary. That means there's a decent amount of information we don't know. But one thing we do know is that the post office is making a profit.
In 2006, Congress ruled that the USPS couldn't set its prices lower than its costs, otherwise it would be able to unfairly charge less than its competitors like UPS and FedEx.
Every year, an independent agency called the Postal Regulatory Commission makes sure the USPS' deals make economic sense. And year after year, the commission has approved the deal with Amazon. In its 2017 annual report, the USPS even said its shipping and packages business helped the "financial picture of the Postal Service."
Trump is right that Amazon does technically receive a discount. Amazon ships a lot of packages, so chances are it's utilizing a bulk discount. But that's not specific to Amazon; it's available to other businesses, too.
That idea that the post office is losing big likely stems from a Citigroup report. The report alleges the USPS' pricing model is unsustainable, and that parcel rates would need to rise significantly for the agency to break even.
The report was mentioned in a widely circulated Wall Street Journal commentary by shipping analyst Josh Sandbulte. The analyst argues that the post office is essentially giving Amazon a $1.46 subsidy for every box it ships.
But if true, that figure would hold for all companies across the board, not just Amazon. Which is probably where Trump is coming up with the claim that the post office "will lose $1.50 on average for each package it delivers for Amazon."
However, the $1.46 figure has been debated. On Tuesday, the Citigroup analyst who wrote the original report clarified that Amazon's business could be profitable for the USPS.
The Postal Service does receive reimbursements for some things mandated by Congress, like free mail for the blind and overseas voting. And it borrows money from the government to pay for its employee health benefits. But most analysts seem to agree that the post office isn't losing a fortune to Amazon.
The USPS declined to comment on this story. The commission did not return CNBC's request for comment.
So if Trump really wants to influence Amazon's relationship with the post office, he might be able to demand a rate reset. But according to some analysts, that could actually end up hurting the post office more than helping it.
In a note to clients on Tuesday, Baird Equity Research said any rate negotiations would likely put "added financial stress on USPS."
But the post office may not be as essential to Amazon. The Postal Service does deliver a good chunk of Amazon's packages. But the retailer also uses UPS, FedEx, DHL Express, a number of regional and specialty retailers, along with its own delivery service called Amazon Logistics. And it's reportedly developing even more ways to break into the delivery business.