Assortative Matching and Searchy

  • Robert Shimer
  • Lones Smith
  • Robert Shimer
  • Lones Smith
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Publication date
January 1996

Abstract

In Becker’s (1973) neoclassical marriage market model, matching is positively assortative if types are complements: i.e. match output f(x; y) is supermodular in x and y. We reprise this famous result assuming time-intensive partner search and transferable output. We prove existence of a search equilibrium with a continuum of types, and then characterize matching. After showing that Becker’s conditions on match output no longer suce for assortative matching, we nd sucient conditions valid for any search frictions and type distribution: supermodularity not only of output f, but also of log fx and log fxy. Symmetric submodularity conditions imply negatively assortative matching. Examples show these conditions are necessary

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