The Role of Inequality for Poverty Reduction

Using World Bank PovcalNet data from 1974-2018 for 135 countries, this paper approximates theidentity that links growth in mean incomes and changes in the distribution of relative incomes to reductions inabsolute poverty, and, in turn, examines the role of income inequality for poverty reduction. The analysis finds thatthe assumption that income is log-normally distributed allows one to approximate the identity well. Using thisapproximation, both the growth and inequality elasticities of poverty reduction are calculated. The inequalityelasticity of poverty reduction is larger, on average, compared to the (absolute) growth elasticity of povertyreduction. Moreover, the (absolute) growth elasticity declines steeply with a country's initial level ofinequality. However, despite these results, most of the observed changes in poverty can be explained by changes inmean incomes. This is a consequence of changes in income inequality (as measured by percentage changes in thestandard deviation of log-income) being an order of magnitude smaller than changes in mean incomes. Overall, theresults highlight the important role income inequality can play in reducing poverty even if prior poverty changes have,in large part, been a consequence of economic growth.