This type of graph is used in probability distributions, and was first created in 1905 by Max Lorenz. Income distribution is also displayed in this form. The one shown above is actually an example used by Answers.com in their definition of a Lorenz Curve.
Where example was found: http://content.answers.com/main/content/img/oxford/Oxford_Geography/0198606737.lorenz-curve.1.jpg
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