Junk mail is not subsidized per se. It does often cost less than non-marketing mail, but this is because it can take advantage of some discounts that lower volu

Junk mail is not subsidized per se. It does often cost less than non-marketing mail, but this is because it can take advantage of some discounts that lower volume senders have a harder time qualifying for. In particular, you can get discounts for pre-sorting and bundling your mailings, formatting things in a way that is easier for USPS to automate, and for high volume.