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The Gini index, also referred to as the Gini coefficient, is one of the most used measurements of income and/or wealth inequality for a given nation, region, or area. It is named after its creator, Corrado Gini, who first published the index in his 1912 work, Variabilita e Mutabilita (Variability and Mutability). The book has never been translated into English. The work is divided into two parts: one that discusses measuring income and wealth inequality quantitatively and another that attempts to measure qualitative aspects of inequality. Although the Gini index is often referred to as a single measurement, there are actually more than a dozen different measurements defined in the original work, most of which have not been utilized. When people mention the Gini index, ...

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