Matching in Cities
利用德国行政数据，研究发现大城市中工人与企业匹配更高效，高质量工人与高质量企业匹配更紧密，这加剧了工资不平等并解释了近三十年地理工资差距的扩大。
Abstract Using administrative German data, we show that large cities allow for a more efficient matching between workers and firms and this has important consequences for geographical inequality. Specifically, the match between high-quality workers and high-quality plants is significantly tighter in large cities relative to small cities. Wages in large cities are higher not only because of the higher worker quality but also because of a stronger assortative matching. Strong assortative matching in large cities magnifies wage differences caused by worker sorting, and is a key factor in explaining the growth of geographical wage disparities over the last three decades.