Most people appreciated when the United States Postal Service started marketing the “priceless” Forever Stamp in 1997. This was a great “do the right thing” moment, tacitly acknowledging that if you don’t use a stamp for a year or five, the Postal Service has still had the use of your money for that time and shouldn’t charge you extra to use it. It seems only fair that a First Class stamp should always cover the postage for a First Class letter.

The compromise was that the Forever stamp was usually pretty generic, such as the American flag stamp. If you wanted a commemorative stamp (such as a Christmas stamp, or one that featured someone important to American culture, such as Rosa Parks), it was going to depreciate like any other stamp.