effects in evaluation studies without knowledge of the participation process. The practical concern is the effects of … fundamental problem of all evaluation studies without good knowledge of the relationship between potential outcomes and the …

The process of matching between firms and workers is an important mechanism in determining the distribution of wages … association of firm-worker matches known as positive assortative matching (PAM). Immigration in a local labor market, by … that the increased degree of positive assortative matching is mainly reached by high-productive firms "losing" lower …