The rise of the superrich has economists, politicians, and citizens alike wondering how much inequality societies can—or should—accept. A study finds its ancient hotbed was the Old World: Societies there tended to be less equal than those in the New World, likely because of the use of draft animals.

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The rise of the superrich has economists, politicians, and citizens alike wondering how much inequality societies can—or should—accept. A study finds its ancient hotbed was the Old World: Societies there tended to be less equal than those in the New World, likely because of the use of draft animals.