Earnings related pension schemes and human capital formation

In this paper, I show that traditional earnings related pay-as-you-go pension systems as we see them in many OECD countries subsidize human capital formation. The reason is that these systems come along with an implicit tax structure that features high tax rates at the beginning of working life and low tax rates toward the end. When the costs of human capital investment are mainly time costs, such an implicit tax structure lowers the costs of human capital investments and simultaneously increases the payoff. The fact that higher skilled workers tend to have steeper wage profiles over the working phase than the unskilled enforces this mechanism. I first show this result in a simple analytical model and then quantify the macroeconomic and welfare effects of making the implicit tax structure age independent in a large-scale overlapping generation model, in which households can invest in human capital both by going to college and through on-the-job training. In terms of welfare, such a reform comes along with a lot of intergenerational redistribution. Although the welfare of current retirees may increase by about 4.5% of their remaining life-time resources, current older workers will lose due to an increase in their implicit tax rates. The welfare of future generations slightly declines by 0.1%.