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The Lorenz Curve
The Lorenz Curve
A Lorenz curve plots the cumulative percentages of total wealth owned against the cumulative number of individuals in a country, starting from the poor and going to the rich. The Gini index measures the area between the Lorenz curve and a hypothetical line of absolute equality, expressed as a fraction of the maximum area under the line. Thus a Gini index of 0 represents perfect equality, while an index of 1 represents perfect inequality. Use the sliders in this Demonstration to see that different Lorenz curves can have the same Gini index and to see what each point in a given Lorenz curve means in terms of the percentage of wealth owned by the poorest.