Accounting for inequality.
By Jill Lepore
For about a century, economic inequality has been measured on a scale, from zero to one, known as the Gini index and named after an Italian statistician, Corrado Gini, who devised it in 1912, when he was twenty-eight and the chair of statistics at the University of Cagliari. If all the income in the world were earned by one person and everyone else earned nothing, the world would have a Gini index of one. If everyone in the world earned exactly the same income, the world would have a Gini index of zero. The United States Census Bureau has been using Gini’s measurement to calculate income inequality in America since 1947. Between 1947 and 1968, the U.S. Gini index dropped to .386, the lowest ever recorded. Then it began to climb.
Income inequality is greater in the United States than in any other democracy in the developed world.
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