The Gini coefficient for the entire world has been estimated by various parties to be between 0.61  GINI index (World Bank estimate). World Bank, Development Research Group. Data are based on primary household survey data obtained from government  12 Aug 2015 Inequality is measured with the Gini index (explained below) and How has inequality in high-income countries evolved over the last century? 19 Nov 2018 Our metric of income inequality is the Gini index – explained here – which is higher in a country with higher inequality. We rely on estimates  average Gini index across all countries has evolved. In Section 2 I outline the most commonly-used approach, based on national household survey data, and  28 Feb 2018 Gini coefficients available The source for global inequality data. Open access, high quality wealth and income inequality data developed by an  To benchmark and monitor income inequality and poverty across countries, the on levels and trends in Gini coefficients before and after taxes and transfers, 

Download scientific diagram | Historical evolution of the global Gini coefficients for natural gas, coal, and petroleum consumption per capita. from publication: 

By doing so, it becomes possible to track very precisely the evolution of all income or wealth levels, from the bottom to the top. The key novelty of the WID.world project is to use such data in a systematic manner, allowing comparisons between countries and over long time periods. This paper—a joint product of the Office of the Vice President and the Economic Policy and Poverty Reduction Division, World Bank Institute—is an extension of the paper “Measuring Educational Inequality: Education Gini Index from 1960 to 1990” (Vinod Thomas, Yan Wang, and Xibo Fan, World Bank, Washington, DC). He began by addressing the recent evolution of inequality between all citizens of the world, regardless of national borders. To do this, Lakner turned to the most common metric of inequality, the Gini index. The more unequal a country's income distribution, the higher its Gini index, e.g., a Sub-Saharan country with an index of 50. If income were distributed with perfect equality the index would be zero; if income were distributed with perfect inequality, the index would be 100.

South Africa is the top country by GINI index in the world. As of 2018, GINI index in South Africa was 57.7 %. The top 5 countries also includes Namibia, Sri Lanka, China, and Zambia. Gini index measures the extent to which the distribution of income or consumption expenditure among individuals or households within an economy deviates from a perfectly equal distribution.

World income Gini index since 1800s. Taking income distribution of all human beings, worldwide income inequality has been constantly increasing since the early 19th century. There was a steady increase in the global income inequality Gini score from 1820 to 2002, with a significant increase between 1980 and 2002. The more unequal a country's income distribution, the higher its Gini index, e.g., a Sub-Saharan country with an index of 50. If income were distributed with perfect equality the index would be zero; if income were distributed with perfect inequality, the index would be 100. By doing so, it becomes possible to track very precisely the evolution of all income or wealth levels, from the bottom to the top. The key novelty of the WID.world project is to use such data in a systematic manner, allowing comparisons between countries and over long time periods. This paper—a joint product of the Office of the Vice President and the Economic Policy and Poverty Reduction Division, World Bank Institute—is an extension of the paper “Measuring Educational Inequality: Education Gini Index from 1960 to 1990” (Vinod Thomas, Yan Wang, and Xibo Fan, World Bank, Washington, DC). He began by addressing the recent evolution of inequality between all citizens of the world, regardless of national borders. To do this, Lakner turned to the most common metric of inequality, the Gini index. The more unequal a country's income distribution, the higher its Gini index, e.g., a Sub-Saharan country with an index of 50. If income were distributed with perfect equality the index would be zero; if income were distributed with perfect inequality, the index would be 100. The index is based on the Gini coefficient, a statistical dispersion measurement that ranks income distribution on a scale between 0 and 1. The measure has been in use since its development by

World income Gini index since 1800s. Taking income distribution of all human beings, worldwide income inequality has been constantly increasing since the early 19th century. There was a steady increase in the global income inequality Gini score from 1820 to 2002, with a significant increase between 1980 and 2002.