(negative) sorting results if the match production function is supermodular (submodular). If the production function is modular, no sorting obtains. We propose an identification strategy that allows identification of not only the presence of sorting in matching, but also the type of sorting,...

model developed by Klette and Kortum (2004) and an equilibrium search model of the labor market with job to job flows introduced by Mortensen (2003). In the construction, a continuum of intermediate product and service varieties are produced with labor that serve as inputs in the production of a...