Vivid maps

Social scientists have used the Gini coefficient as the most common measure of global inequality (the income or wealth distribution of a nation’s residents). It was developed by the Italian statistician and sociologist Corrado Gini and published in 1912. A Gini coefficient of zero expresses perfect equality, where everyone has the same income. A Gini coefficient of 1 (or 100%) expresses maximal inequality among peoples.