Consumption and leisure externalities, economic growth and equilibrium efficiency

This paper analyzes the effects of consumption and leisure externalities on growth and welfare in a two-sector endogenous growth model with human capital accumulation. Both types of externalities are shown to affect the long-run equilibrium and optimal growth rates in a rather different way. The relationship between the steady state of the market and the centrally planned economy is also analyzed. The optimal growth path can be decentralized by resorting to consumption or labor income taxation, whereas capital income should be untaxed. Numerical simulations suggest that growth and welfare effects of mild consumption and leisure externalities may be quantitatively important.