Why The USPS Pushes New Stamps

Seigniorage is the profit that governments make on securities that they issue, on which they don’t pay interest, and that are retained unused by the public. Cash in mattresses represents a form of seigniorage, and, more than anything else, old face value postage stamps held by collectors do as well. The money that collectors have tied up in mint stamps represents an interest free loan to our post office. And because most mint stamps held by collectors will never be used, the profit to the post office is the value of those stamps held by collectors (Private companies issue gift cards, and they are required by accounting rules to bring the unused portion of these cards into income