The Lorenz curve is used an economics and is defined as graphical
representation of the cumulative distribution function of the empirical
probability distribution of wealth.
This means that it is a used to represent income distribution and
therefore the inequality in wealth.
This graph is formed by plotting the cumulative distribution of the
amount of the variable concerned against the cumulative frequency distribution
of the individuals possessing the amount.
The Lorenz curve shown above illustrates the cumulative share of the
income earned by people from lowest to highest incomes.
The map URL is: http://en.wikipedia.org/wiki/Lorenz_curve
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