Strategic ambiguity in global games

Takashi Ui

Games and Economic Behavior, 2025, vol. 149, issue C, 65-81

Abstract: In games with incomplete and ambiguous information, rational behavior depends not only on fundamental ambiguity (ambiguity about states) but also on strategic ambiguity (ambiguity about others' actions), which further induces hierarchies of ambiguous beliefs. We study the impacts of strategic ambiguity in global games and demonstrate the distinct effects of ambiguous-quality and low-quality information. Ambiguous-quality information makes more players choose an action yielding a constant payoff, whereas (unambiguous) low-quality information makes more players choose an ex-ante best response to the uniform belief over the opponents' actions. If the ex-ante best-response action yields a constant payoff, sufficiently ambiguous-quality information induces a unique equilibrium, whereas sufficiently low-quality information generates multiple equilibria. In applications to financial crises, we show that news of more ambiguous quality triggers a debt rollover crisis, whereas news of less ambiguous quality triggers a currency crisis.

Keywords: Strategic ambiguity; Global game; Currency crisis; Debt rollover crisis; Incomplete information; Multiple priors (search for similar items in EconPapers)
JEL-codes: C72 D81 D82 (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:gamebe:v:149:y:2025:i:c:p:65-81

DOI: 10.1016/j.geb.2024.11.004

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