Just as for profit and not for profit businesses and organizations can write off bad-debt, which is a revenue they will never collect, one would think the USPS could write off an obligation that it is reasonably certain, based on past statistical tendencies, it would never have to fulfill, and book the revenue. As the song says, "Go on, take the money and run."
Coverage in Linns (may 2017) seems to suggest that there has been for decades some sort of routine calculation that there was a certain amount of "breakage," as the postal service called the phenomenon of sold stamps never being used. And that this "breakage" rate allowed them to book the revenue on the "breakage"after a couple years. Issue of forever stamps threatened to change the percentage, but it seems to have stabilized . 6% is the magic number. Given USPS volume, that adds up to real money, so getting the figure right is a detail they sweat.
https://www.linns.com/news/us-stamp...tments.html.Here's to "breakage". May all of us contribute to its growth.
- Jonathan