Two phenomena help explain this city/country happiness gap. The first is a rather curious number: 150. Consider the following set of figures: 148.4 150 150-200 125 Those numbers represent the population averages of hunter-gatherer tribes, Stone Age groups, villages in ancient Mesopotamia, and ancient Roman military legions. A group of roughly 150 people or fewer seems to be an ideal community. It even has a name, Dunbar’s number, after British anthropologist Robin Dunbar, who discovered it. As we evolved, groups of fewer than 150 people gave us enough resources to hunt, raise kids, share, and
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