Income Inequality and Economic Growth: A Simple Theoretical Synthesis

We show that in an AK model of endogenous growth with CRRA specifications for both private and public consumption goods, income inequality exerts theoretically ambiguous effects on the optimal capital tax rate and the economy¡¯s growth rate. In a calibrated version of the model, we find that the parameter space can be clearly divided into regions that exhibit a positive or negative relationship between income inequality and economic growth. Hence, our analysis provides a theoretical synthesis on the relationship between inequality and growth and helps bring together some recent results in the literature.