Social and Evolutionary Rationality

We live in a social world. Most other animals do too. The social world affords many opportunities and challenges for decision making, from the benefi ts of collective cognition and cooperation to the costs of groupthink and cut-throat competition. Some social situations appear, at least at the moment, to be uniquely human. For instance, morality in humans has been studied for millennia, with dozens of viewpoints on what behavior is morally permissible. But do morally relevant situations always require special sophisticated decision-making processes, or can simple heuristics play a role in moral behavior?