Center for Mathematical Economics Working Papers No. 661
Bielefeld University, Center for Mathematical Economics (IMW), Bielefeld
We provide an abstract framework for submodular mean field games and identify verifiable sufficient conditions that allow to prove existence and approximation of strong mean field equilibria in models where data may not be continuous with respect to the measure parameter and common noise is allowed. The setting is general enough to encompass qualitatively different problems, such as mean field games for discrete time finite space Markov chains, singularly controlled and reflected diffusions, and mean field games of optimal timing. Our analysis hinges on Tarski's fixed point theorem, along with technical results on lattices of flows of probability and sub-probability measures.
Mean field games submodularity complete lattice of measures Tarski's fixedpoint theorem Markov chain singular stochastic control reflected diffusion optimal stopping