Population in Richest Zip Codes Keeps Growing

It should come as no surprise that rich people like living around other rich people. From Shibuya in Tokyo and the Seventh Arrondissement in Paris to Manhattan’s Upper East Side and the tree-lined avenues of Palm Beach, Fla., wealth gravitates to wealth. As the global income gap between rich and poor widens, the richest neighborhoods keep getting richer—and bigger.

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