FREE MONEY?! Sell Ads on $1 Bill

Imagine if our currency had a little "Brought to you by" section. Sell enough sponsorships, and voila, free money! Blasphemous! Sacrilegous! Tacky! you say. But this could be an ideal form of welfare. Free money for the poor, at no cost to taxpayers. Couldn't possibly raise a dollar per dollar-bill? OK, how ads on coins. Surely on pennies, the Treasury could turn a profit. And you could, too, if those ads said, "$1 off a box of Jiffy Pop." Too crass? Maybe inscribe teeny ads on the rims?