The Lorenz curve is used in economics and ecology to describe inequality in wealth or size. It is a graphical representation of the proportionality of a distribution (the cumulative percentage of the values).
A graph for showing the concentration of ownership of economic quantities such as wealth and income, it 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 above illustrates a representation of the cumulative distribution of income by population.
http://content.answers.com/main/content/img/oxford/Oxford_Geography/0198606737.lorenz-curve.1.jpg
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