How is a dollar bill different from a postage stamp? Both are produced by the government and seen by hundreds of millions of people each year. How come the government allows advertising on one and not on another?
One artist did the math and figured out that the typical one hundred dollar bill changes three times per week and lasts 7.4 years. If the Bureau of Engraving and Printing sold ad space on the back of a $100 bill, they could charge one dollar per bill to print the advertising and the CPM (cost per thousand impressions) rate would end being about $1. That’s on par with pretty cheap web advertising.