In hunter-gatherer days, a conflict with another individual could be a threat to survival. Human beings instinctually respond to threats with two primary behaviors: fight or flight. If the individual feels that he has adequate strength and resources, he may stay and fight. If he feels he cannot win, he flees to safety. Neither of these options is optimal for group living. Infighting expends precious energy, which could be better used to gather food, raise young, and fortify the group. Flight is also problematic. If a member leaves the group every time there’s a problem, the group will weaken
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