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Abstract
Seeking to understand and reduce partisan hostility, we propose that humans evolved to benefit from cultural societies. Societies perform two crucial tasks, which have grown apart and are now championed by political opponents: (1) amassing resources, and (2) distributing resources. The political right focuses on amassing resources, whereas the political left focuses on redistributing resources. Both tasks are needed for society to flourish, but they foster contrary policies. This explains how left and right disagree on moral emphases, attitudes about time, rights versus responsibilities, manipulative strategies, and societal enemies-and why sharing or alternation in power benefits society. Market economies use incentives to create wealth, but these increase inequality. We hope our theory will help foster mutual respect among those on the left and right as both sides come to appreciate what the other side does to benefit society.
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