I went to buy stamps today - 39 cents each. $7.80 for book of 20 and I wondered - why do the write .39 cents on the front of the stamp and lock it into a specific value? When I go to the post office, I think I'm buying the right to mail 20 first class letters when I buy 20 stamps. Shouldn't I always be able to mail a first class letter with one of those stamps? Or is it really just conveniently-sticky currency? I'll ask next time...
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