社會流動性，以收入的5分法來衡量 (出生到40歲)
If black America were a country, it would have a worse life expectancy than Mexico, a worse homicide rate than Ivory Coast and a higher proportion of its citizens behind bars than anywhere on earth. In terms of social mobility, it would be far harder to rise through the wealth ranks than in white America, however wealthy the starting pointhttp://econ.st/1zVBsgF
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