As others have noted, the fact that bulk mail rates are lower per piece does not mean the postal service isn't making money or that the price is less than the m

As others have noted, the fact that bulk mail rates are lower per piece does not mean the postal service isn't making money or that the price is less than the marginal cost. Junk mail is a cash cow for USPS, and it couldn't survive without it unless it raised prices on normal mail.