In this paper, we analyze how the implicit tax rate can be smoothed in a pay-as-you-go system if life expectancy increases or if the rate of population growth declines. We show that generation-specific contribution or replacement rates are necessary to smooth the implicit tax rate. Partial...

In a two-period world with endogenous savings and two assets, the optimal tax structure and optimal diversification of aggregate (capital) risk between private and public consumption are analyzed. We show that there is no trade-off between efficiency in intertemporal consumption and allocation...