I study a version of the search-theoretic model of imperfect competition by Burdett and Judd (1983) in which sellers face a strictly increasing rather than a constant marginal cost of production. The equilibrium exists and is unique, and its structure depends on the extent of search frictions....

Can increasing returns to scale in search explain regional differentiation between cities and rural areas? To answer this question, we develop a model of an economy that consists of several regions. Within each region, jobs and workers are heterogeneous by respectively skill and job complexity...

We study the implementation of constrained-efficient allocations in labour markets where a basic coordination problem leads to an equilibrium matching friction. We argue that these allocations can be achieved in a non-cooperative equilibrium if wages are determined by ex post bidding. This holds...