We often discuss individual morality and ethics on the show–how people should or should not behave on an interpersonal level. But what about groups of people? How should they make sense of their competing value systems? On this month’s episode, we’re talking to Joshua Greene, who has an idea about how groups–what he calls modern tribes–should get along. He thinks people should develop something he calls a metamorality. And for him, the best contender for this metamorality is utilitarianism. He also describes how our brains make moral decisions–and why this matters when we’re thinking about morality amongst groups of people.

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