The mechanism seems simple: poor people are forced to share their time and resources more than wealthy people are, and as a result they live in closer communities. Inter-reliant poverty comes with its own stresses—and certainly isn’t the American ideal—but it’s much closer to our evolutionary heritage than affluence. A wealthy person who has never had to rely on help and resources from his community is leading a privileged life that falls way outside more than a million years of human experience. Financial independence can lead to isolation, and isolation can put people at a greatly increased
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