It turns out that the USPS makes much of its money from junk mail, and
Zac Bissonnette has a brilliant way to use this to make the big banks bankroll the Post Office, which is a good way to support Saturday service, and its flat rate for anywhere in the country:

Almost daily, I receive at least one pre-approved credit card offer from a big national bank that received bailout money from U.S. taxpayers. I hate big banks, and I hate bailouts, and I really hate it when my bailout money is used to send me junk mail I didn’t ask for and don’t want.

………

Instead, a grassroots bailout — this time, of the post office. This time, paid for by the bailed-out banks. We can do it. Here’s how: From now on, don’t just throw out those credit card offers. Instead, put the paperwork in the “postage will be paid by addressee” envelope (first removing anything with your name on it) and drop it back in the mailbox. You’ve just transferred the cost of mailing that letter from the not-so-needy Chase/Citi/Bank of America to the oh-so-needy USPS. Who needs Robin Hood when we have postage-paid envelopes?

The U.S. has 307 million people. If each person received an average of just one credit card offer a month (most adults get more than that, while children get none) and mailed it back to the bank without a signed application, at a cost to the bank of 44 cents postage, U.S. consumers could transfer $135 million a month from the banks to the Postal Service.

Truth be told, the net for the USPS is less than that, but it’s probably at least a dime, since much of what we pay is for maintaining the the postal infrastructure.

I’m not suggesting that you use it to send a brick, that would be abusive, but it is a good way to generate some additional revenue for your Postal Service.

It also has the advantage of raising the cost to junk mailers to sending you this crap, which might make them send you less crap.