Accumulative line graph or Lorenz curve is a graphical representation of the cumulative distribution function of a probability distribution. The graph I found shows the two variables as being "cumulative percent of income" and "cumulative percent of population" and shows the perfect equality reference line, related to the area of inequality. I found this graph here http://www.unc.edu/depts/econ/byrns_web/Art/Glossary/LorenzCurve.jpg
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