David Friedman has never taken an economics class in his life. Sure, he's taught economics at UCLA. Chicago, Tulane, Cornell, and Santa Clara, but don't hold that against him. After all, everyone's an economist. We all make daily decisions that rely, consciously or not, on an acute understanding of economic theory--from picking the fastest checkout tine at the supermarket to voting or not voting, from negotiating the best job offer to finding the...