Not just diamonds are forever

Kansas City Star: Britain and France have them. So do Israel and Brazil. Soon Americans will be able to buy them as well. The idea is the "forever stamp," one that will still work no matter how many times the Postal Service raises rates.
The Postal Regulatory Commission recently recommended that the Postal Service soon begin issuing the new stamps.
Forever stamps will keep many Americans from having to buy 1- or 2-cent add-on stamps whenever postage goes up.
Buyers should expect more frequent rate increases because a law signed in December will tie postage rates to inflation. Given the inflation over the last few decades, that means rates will probably go up every year.