In the empirical literature on assortative matching using linked employer-employee data, unobserved worker quality appears to be "negatively" correlated with unobserved firm quality. We show that this can be caused by standard estimation error. We develop formulae that show that the estimated...

Recent policy debate in Europe suggests that a shorter workweek will lead to more jobs (worksharing). We derive and estimate a model where the firm employs two types of workers, some working overtime, the rest standard hours. Worksharing is not always a prediction of the theory. Using German...

Limited Mobility Bias explains why positive assortative matching is not observed in the empirical literature. Using German social security records, we estimate the correlation between worker and firm contributions to wage equations and find that it is unambiguously positive.