How far is the US social insurance system from an efficient system? We answer this question within a model where agents receive idiosyncratic, labor-productivity shocks that are privately observed. When social security and income taxation comprise the social insurance system, the maximum...

This paper examines the value of an individual's human capital and the associated return on human capital using U.S. data on male earnings and financial asset returns. We find that (1) the value of human capital is far below the value implied by discounting earnings at the risk-free rate and (2)...

This paper posits a notion of the value of an individual's human capital and the associated return on human capital. These concepts are examined using U.S. data on male earnings and financial asset returns. We find that (1) the value of human capital is far below the value implied by discounting...

Is lifetime inequality mainly due to differences across people established early in life or to differences in luck experienced over the working lifetime? We answer this question within a model that features idiosyncratic shocks to human capital, estimated directly from data, as well as...