This graph shows the values of the cumulative population versus the cumulative income during both the '01-'02 year and '05-'06 year. The perfect equality line is inserted to depict what the equally proportional values would be. The area above the line is considered the equal area and the area below it is considered the inequal area.
http://www.northlan.gov.uk/business+and+employment/local+economy/economic+information/lorenz+curve.jpg
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