Poeschel, Friedrich - Verein für Socialpolitik - VfS - 2012
equilibrium with perfect sorting arises despite frictions. We find that supermodularity of the match production function is a … necessary and sufficient condition. This is a weaker condition than is needed for sorting in models without signals, which may … explain why sorting is much more widespread in reality than existing models would suggest. Supermodularity functions here as …