A well-known empirical regularity is that small firms are less productive than large firms. However, does size cause productivity or vice versa? Using firm-level administrative data for Spain, I find that productivity shocks are followed by significant increases in size defined by employment. In...

Women have always earned less than men, with men's greater physical strength explaining a large portion of the difference. This raises the question of why the gender gap did not disappear when the importance of physical strength waned with the emergence of the modern labor market. This paper...