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Existence of Strong Randomized Equilibria in Mean-Field Games of Optimal Stopping with Common Noise

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arxiv 2507.19123 v1 pith:GRSKVQJM submitted 2025-07-25 math.OC math.PRq-fin.MF

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keywords mean-fieldcommonnoisestoppingstrongrandomizedassumptionsequilibria
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We study a mean-field game of optimal stopping and investigate the existence of strong solutions via a connection with the Bank-El Karoui's representation problem. Under certain continuity assumptions, where the common noise is generated by a countable partition, we show that a strong randomized mean-field equilibrium exists, in which the mean-field interaction term is adapted to the common noise and the stopping time is randomized. Furthermore, under suitable monotonicity assumptions and for a general common noise, we provide a comparative statics analysis of the set of strong mean-field equilibria with strict equilibrium stopping times.

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  1. A new probabilistic approach for mean field games of optimal stopping

    math.PR 2026-07 conditional novelty 7.0 of 10

    Randomized mean-field equilibria of optimal-stopping games are characterized by a coupled reflected McKean–Vlasov forward-backward SDE system whose survival process L is an endogenous part of the solution.

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