An economic trick from Steven Landsburg using a $20 bill:
One of my favorite classroom tricks is to auction off a $20 bill. I explain in advance that the $20 goes to the top bidder, but the top two bidders have to pay whtatever they bid. That way, if at least two students bid at least $10, I come out ahead.
Keep reading to see how this works and what this has to do with campaign finance reform.
(HT haha.nu)
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