Local labor market size and qualification mismatch
利用德国调查数据，研究发现大城市工人过度资格化或跨领域工作的可能性更低，且这种差异不能完全由人才向城市集聚解释，表明集聚经济通过改善岗位匹配发挥作用。
Abstract This paper investigates the effect of the size of the local labor market on skill mismatch. Using survey data for Germany, I find that workers in large cities are both less likely to be overqualified for their job and to work in a different field than the one for which they trained. Different empirical strategies are employed to account for the potential sorting of talented workers into more urbanized areas. Results on individuals who have never moved away from the place in which they grew up and fixed effects estimates obtaining identification through regional migrants suggest that sorting does not fully explain the existing differences in qualification mismatch across areas. This provides evidence of the existence of agglomeration economies through better matches. However, lower qualification mismatch in larger cities is found to explain at best a small part of the urban wage premium.