Not to mention, they are required to prefund pensions for their employees, something no other entity is required to do. They also are required to take a letter from anywhere in the country, and deliver it to anywhere else in the country, within a couple days, for less than 50 cents.

> for operating expenses

that raises some eyebrows :P

Why this qualifier? What do they receive tax dollars for?

They receive $100 million in tax dollars per year to subsidize blind and overseas citizens. They also get $18 billion per year in tax benefits.

http://www.politifact.com/georgia/statements/2013/jul/24/ame...

http://fortune.com/2015/03/27/us-postal-service/