The Gini Index, the most commonly used metric to gauge a society's income inequality. On the Gini Index, zero equals perfect equality and one represents absolute inequality in which one person owns everything. It takes its name from the early 20th century, Italian statistician Corrado Gini, who first developed the measurement. And using this Gini Index, America as a whole has a degree of income inequality that is higher than almost any other developed country, according to the most recent data compiled by the Organization for Economic Cooperation and Development. According to the study, only Chile, Mexico and Turkey rank higher in inequality among the 34 members of the OECD.
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