Private Observation, Communication and Collusion

Michihiro Kandori and Hitoshi Matsushima

Econometrica, 1998, vol. 66, issue 3, 627-652

Abstract: The authors examine discounted repeated games where players privately observe different signals. A leading example is secret price cutting; a firm cannot directly observe rival firms' price cutting but its own sales can imperfectly indicate what is going on. The characterization of equilibria in this class of games has been an open question. The authors construct equilibria where players voluntarily communicate what they have observed and prove folk theorems. Their results thus provide a theoretical support for the conventional wisdom that communication facilitates collusion.

Date: 1998
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