Portuguese firms engage in intense reallocation, most employers simultaneously hire andseparate from workers, resulting in a large heterogeneity of flows and excess turnover. Largeand older firms have lower flows, but high excess turnover rates. In small firms, hires andseparations move...

In contrast to the very large literature on skill-biased technical change among workers, thereis hardly any work on the importance of skills for the entrepreneurs who employ thoseworkers, and in particular on their evolution over time. This paper proposes a simple theory ofskill-biased change in...