This paper considers the impact of endogenous human capital accumulation on optimal tax policy in a life cycle model. Including endogenous human capital accumulation, either through learning-by-doing or learning-or-doing, is analytically shown to create a motive for the government to use...

I develop a new measure of human capital stock that has two advantages over previous measures. First, it allows for varying costs of education across time, countries, and level of education. Second, the unit of measurement is dollars, which allows comparison of human capital stocks with other...

It is well known that turnover rates fall with employee tenure and employer size. We document a new empirical fact about turnover: Among surviving employers, separation rates are positively related to industry-level exit rates, even after controlling for tenure and size. Specifically, in a...

Entrepreneurial human capital plays a relatively more important role in intermediate income countries, but professional human capital is relatively more abundant in richer economies. Because the return to entrepreneurship is risky, individuals devote less time to the accumulation of...

This paper reviews research that uses longitudinal microdata to document productivity movements and to examine factors behind productivity growth. The research explores the dispersion of productivity across firms and establishments, the persistence of productivity differentials, the consequences...

This paper examines whether the average level of human capital in a region affects the earnings of an individual residing in that region in a manner that is external to the individual's own human capital. I find little evidence of an external effect of human capital, which suggests that human...