The incentives to search for employment vary systematically over the life cycle and with idiosyncratic productivity. These variations should be accounted for when designing UI policy. Using a life cycle model with endogenous human capital accumulation and permanent differences in worker...

The unfunded social security has long been criticized for reducing capital stock and social welfare. In this paper, we study the aggregate and welfare effects of reforms that make social security tax (SST) age dependent. We characterize the optimal age-dependent SST schedule that maximizes...