"Rock breaks scissors is based on a simple principle: people are unable to act randomly. Instead they display unconscious patterns that the savvy person can outguess. The principle applies to friends playing rock, paper, scissors for a bar tab as well as to the crowds that create markets for homes and stocks. With a gift for distilling psychology and behavioral economics into accessible advice, Poundstone proves that outguessing is easy, fun, and often profitable"--Dust jacket flap