<P> Causes of income inequality and of levels of equality / inequality include: tax policies, other economic policies, labor union policies, Federal Reserve monetary policies & fiscal polices, the market for labor, abilities of individual workers, technology and automation, education, globalization, gender, race, and culture . </P> <P> Using Gini coefficients, several organizations, such as the United Nations (UN) and the US Central Intelligence Agency (CIA), have measured income inequality by country . The Gini index is also widely used within the World Bank . It is an accurate and reliable index for measuring income distribution on a country by country level . The Gini index measurements go from 0 to 1 for 1 being perfect inequality and 0 being perfect equality . The world Gini index is measured at 0.52 as of 2016 . </P> <Ul> <Li> <P> 2014 World Gini Index </P> </Li> </Ul> <Li> <P> 2014 World Gini Index </P> </Li>

Explain the central problem of distribution of income