This is a list of countries by inequality-adjusted income, as defined and measured by the United Nations Development Programme (UNDP). The income index is one component of the Human Development Index (HDI), but is also used separately.
Adjusting income for inequality based on the Gini coefficient was first proposed by Amartya Sen in 1976. The UN first applied the adjustment to income data in 1993, before it was later expanded to the general HDI.