It is not a monopoly, because other companies are allowed to compete, and have done so effectively, to the financial detriment of the service.
OK call what you wish, as ya continue to grab over and bend yer ankles...
BS, others are not allowed to compete in the letter business which is where the big drop in participation has come. The package business is another story and the PO has been literally shown the door as the competition has proven they do it better and cheaper.
Really? So it's legal for me to carry mail back with me from Japan on the airplane and walk through my neighborhood placing it in appropriate mailboxes?
Horsepuckey. I can't even legally put a neighborhood watch notice in my neighbor's mail box.