A common yardstick for measuring societal equality is the Gini coefficient, which runs from 0 (everyone has the same income) to 1 (one person has all the income). Most countries range between 0.25 and 0.6. The Economist shows that the Gini coefficient has gone up a lot in some rich countries since the 1980s. And as poor countries are on average growing faster than rich ones, inequality in the world as a whole is falling.
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