The Gini coefficient is a number between 0 and 1, where 0 corresponds with perfect equality (where everyone has the same income) and 1 corresponds with perfect inequality (where one person has all the income—and everyone else has zero income). Income distribution can vary greatly from wealth distribution in a country (see List of countries by distribution of wealth). Income from black market economic activity is not included and is the subject of current economic research.
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Key: R/P 10%: The ratio of the average income of the richest 10% to the poorest 10% R/P 20%: The ratio of average income of the richest 20% to the poorest 20% Gini: Gini index, a quantified representation of a nation's Lorenz curve
^Global Peace Index calculation incorporates UN Gini scores where available, so countries with a UN Gini calculation are left blank in this column. At  click on each country to see its Gini coefficient. Year is not given. "There are, nevertheless, some problems with the Gini-coefficient; there is a considerable lag in the publication of statistics for many countries suffers, forcing the Economist Intelligence Unit to estimate the coefficient for a sizeable proportion of the 153 countries in the GPI. These problems of measurement look likely to persist for the foreseeable future, and the use of other measures of income inequality may be more effective."