USPS normal letter volumes are falling, but due to various stupid crap they are forced to deliver a lot of junk mail at low price. Political issue rather than t

USPS normal letter volumes are falling, but due to various stupid crap they are forced to deliver a lot of junk mail at low price. Political issue rather than technical. The difference for parcel services is that, statistically, they do not deliver a parcel to everyone every time, making it way easier to do "p2p" because you're not canvassing a whole street.