Suppose there are two small island countries: Avarice, which is populated by people who are completely self-interested, and Altruism, which is populated by people who have adopted social norms of generosity and cooperation. Suppose residents of each island often play prisoner's dilemma games, always matched with a person from the same island, but not a person who they know or will play with again. If the same number of games is played on each island, you would expect: