> It's not a monopoly. From http://en.wikipedia.org/wiki/United_States_Postal_Service http://en.wikipedia.org/wiki/United_States_Postal_Service Article I, sec

> It's not a monopoly. From http://en.wikipedia.org/wiki/United_States_Postal_Service http://en.wikipedia.org/wiki/United_States_Postal_Service Article I, section 8, Clause 7 of the United States Constitution grants Congress the power to establish post offices and post roads, which has been interpreted as a de facto Congressional monopoly over the delivery of mail. Accordingly, no other system for delivering mail – public or private – can be established, absent Congress's consent. Congress has delegated to the Postal Service the power to decide whether others may compete with it, and the Postal Service has allowed an exception to its monopoly for extremely urgent letters.