As we left the business school to walk over to the faculty club where we would have lunch, I spotted a twenty-dollar bill lying on the sidewalk, right outside the building. Naturally I picked it up, and then everyone started laughing. We were laughing because we all realized the irony of this situation. There is an old joke that says a Chicago economist would not bother to pick up a twenty-dollar bill on the sidewalk because if it were real, someone would already have snagged it. There is no such thing as a free lunch or a free twenty-dollar bill. But to a heretic like me, that twenty looked
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