Mixed Markov-Perfect Equilibria in the Continuous-Time War of Attrition

Abstract

We prove the existence of a Markov-perfect equilibrium in randomized stopping times for a model of the war of attrition in which the underlying state variable follows a homogenous linear diffusion. We first prove that the space of Markovian randomized stopping times can be topologized as a compact absolute retract. This in turn enables us to use a powerful fixed-point theorem by Eilenberg and Montgomery [16] to prove our existence theorem. We illustrate our results with an example of a war of attrition that admits a mixed-strategy Markov-perfect equilibrium but no pure-strategy Markovperfect equilibrium.

Keywords

Reference

Jean-Paul Décamps, Thomas Mariotti, and Fabien Gensbittel, “Mixed Markov-Perfect Equilibria in the Continuous-Time War of Attrition”, TSE Working Paper, n. 24-1562, August 2024.