No abstract.

This paper presents a technique for qualitative comparative statics analysis in dynamic programming models. Let the value function v be the fixed point of a contraction mapping which depends differentially on some exogenous parameter theta. Then the derivative of v with respect to theta exists...

We analyze the implications of multiple applications by job seekers for the microfoundations of the matching function. We emphasize a coordination failure caused by multiple applications, namely, that firms can waste resources processing applicants who are ultimately hired elsewhere.