The Prisoner's Dilemma is a famous problem in game theory. Inits simplest form, two players are faced with independent choices: tocooperate or not to cooperate. Each does better if both cooperate thanif neither does; but each does better if he does not cooperate whateverthe other does. The outcome of their choice can be the differencebetween life and death. Philosophers see this problem as an abstactmodel of the classic conflict between self-interest...