The politifact article cites its sources, including https://about.usps.com/news/statements/080117.htm https://about.usps.com/news/statements/080117.htm which sa

The politifact article cites its sources, including https://about.usps.com/news/statements/080117.htm https://about.usps.com/news/statements/080117.htm which says "By law our competitive package products, including those that we deliver for Amazon, must cover their costs." Whats your source that they charge amazon less than it costs them to deliver?