Altruism and Complexity

Marlow and Berbesque find that "third-party" punishment occurs more often in more complex societies. Second party punishment is defined as punishing those who cheat, or do not cooperate with you. Third party punishment is defined as punishing those who cheat or don't cooperate with others. Perhaps the more complex a society you have, the more control you need over the people and the more control you need, the more sophisticated mechanisms of punishment you need?