Results | Inequality in median household income between the top and bottom percentiles appeared to vary randomly over time (Figure The ratio of the 99th percentile to the 1st percentile ranged from 4.12 at its highest in 1989 to 3.64 in 2010 at its lowest. Racial inequality between counties rose over time (Figure, B). The ratio of the counties with the fewest percentage of minorities and counties with highest percentage of minorities went from 4.38 in 1990 at its lowest to 5.48 in 2010 at its highest.
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Tipirneni et al. (2017) studied this question.