Per the USPS, it looks like there is an opening in law: https://about.usps.com/publications/pub542/pub542_ch5_001.htm https://about.usps.com/publications/pub54

Per the USPS, it looks like there is an opening in law: https://about.usps.com/publications/pub542/pub542_ch5_001.htm https://about.usps.com/publications/pub542/pub542_ch5_001.ht... USPS has to get paid the going rate for postage. But given that no private carriers are within a factor of 10 of USPS pricing, that seems like it's not the barrier here. (Also: much easier to make the argument that the $1.00 letter service from FedEx could be $0.45 if Congress would update the relevant law.) This really looks like the private carriers have carved off the profitable part (rapid delivery) and leave USPS with the hard, unprofitable part (delivery to 100% of addresses, for $0.55).