I believe it’s a reference to the Private Express Statutes ( https://en.wikipedia.org/wiki/Private_Express_Statutes https://en.wikipedia.org/wiki/Private_Expres

I believe it’s a reference to the Private Express Statutes ( https://en.wikipedia.org/wiki/Private_Express_Statutes https://en.wikipedia.org/wiki/Private_Express_Statutes ). I don’t remember the law requiring flat rates, but the rates are regulated and effectively required to be more than the post office’s. FedEx, UPS, DHL, etc. can’t legally compete with the post office on price.