We estimate a panel model where the relationship between inequality and GDP per capita depends on countries' initial incomes. Estimates of the model show that the relationship between inequality and GDP per capita is significantly decreasing in countries' initial incomes. Results from instrumental variables regressions show that in Low Income Countries transitional growth is boosted by greater income inequality.
In High Income Countries inequality has a significant negative effect on transitional growth. For the median country in the world, with a year 2015 PPP GDP per capita of around 10000USD, IV estimates predict that a 1 percentage point increase in the Gini coefficient decreases GDP per capita growth over a 5-year period by over 1 percentage point; the long-run effect on the level of GDP per capita is around -5 percent.