Gini Index

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Dictionary Says

Definition of 'Gini Index'


A measurement of the income distribution of a country's residents. This number, which ranges between 0 and 1 and is based on residents' net income, helps define the gap between the rich and the poor, with 0 representing perfect equality and 1 representing perfect inequality.

Investopedia Says

Investopedia explains 'Gini Index'


The index is named after its developer, Corrado Gini, an Italian statistician of the early 20th century. It is typically expressed as a percentage, so a 20 coefficient would be shown as 20%.

Don't mistake the measurement of income distribution with the measurement of wealth. A wealthy country and a poor country can have the same Gini coefficient, even if the wealthy country has a relatively equal distribution of affluent residents and the poor country has a relatively equal distribution of cash-strapped residents.

The Gini index is only as accurate as the gross domestic product (GDP) and income data that a country produces. Many developing nations do not produce accurate or trusted economic data, so the index becomes more of an estimate. There is also a generally negative correlation between Gini coefficients and per-capita GDP, because poorer nations tend to have higher index figures.

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