The Gini coefficient is a measure of statistical dispersion most prominently used as a measure
of inequality of income distribution or inequality of wealth distribution. It is defined as a ratio
with values between 0 and 1: the numerator is the area between the Lorenz curve of the
distribution and the uniform distribution line; the denominator is the area under the uniform
distribution line. Thus, a low Gini coefficient indicates more equal income or wealth
distribution, while a high Gini coefficient indicates more unequal distribution. 0 corresponds
to perfect equality (everyone having exactly the same income) and 1 corresponds to perfect
inequality (where one person has all the income, while everyone else has zero income). The
Gini coefficient requires that no one have a negative net income or wealth.
Income Gini coefficients in the world
A complete listing is in list of countries by income equality; the article economic inequality
discusses the social and policy aspects of income and asset inequality.
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 Spring '08
 h
 Gini coefficient, Distribution of wealth, Income inequality metrics

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