Income distributions for various US cities for the purpose of testing the "donut" hypothesis, "the idea that a city will create concentric rings of wealth and poverty, with the rich both in the suburbs and in the 'revitalized' downtown, and the poor stuck in between." The hypothesis is valid for older cities, but in newer ones, "one finds 'wedges' of wealth occupying a continuous pie-slice from the center to the periphery". (via moon river)
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