Lorenz Curve Map

http://www.maxi-pedia.com/lorenz+curve

This is an example of the Lorenz Curve which shows the cumulative distribution function of the empirical probability of the distribution of wealth.  In essence it is a graph showing the proportion of this distribution that we assume by the bottom percent of the values.  Above it shows income distribution with the percentage of population on the x axis and the actual income as a result on the y.