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Eloisa Campioni - Università di Roma "Tor Vergata"
Monday 29 November 2021, 04:30pm - 06:00pm

Keeping the Agents in the Dark: Private Disclosures in Competing Mechanisms ”, with Andrea Attar, Thomas Mariotti, and Alessandro Pavan


Abstract: 

We study games in which several principals contract with several privately-informed agents. We show that enabling the principals to engage in contractible private disclosures (by sending private signals to the agents about how the mechanisms will respond to the agents’ messages) can significantly affect the predictions of such games. Our first result shows that equilibrium outcomes and payoffs of games without private disclosures need not be sustainable when private disclosures are allowed. The result thus challenges the robustness of the "folk theorems" of Yamashita (2010) and Peters and Troncoso-Valverde (2013). Our second result shows that private disclosures may generate equilibrium outcomes that cannot be supported in any game without private disclosures, no matter the richness of the message spaces and the availability of public randomizing devices. The result thus challenges the canonicity of the universal mechanisms of Epstein and Peters (1999). These findings call for a novel approach to the analysis of competing-mechanism games.

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