Sampled fictitious play is Hannan consistent

Zifan Li and Ambuj Tewari

Games and Economic Behavior, 2018, vol. 109, issue C, 401-412

Abstract: Fictitious play is a simple and widely studied adaptive heuristic for playing repeated games. It is well known that fictitious play fails to be Hannan consistent. Several variants of fictitious play including regret matching, generalized regret matching and smooth fictitious play, are known to be Hannan consistent. In this note, we consider sampled fictitious play: at each round, the player samples past times and plays the best response to previous moves of other players at the sampled time points. We show that sampled fictitious play, using Bernoulli sampling, is Hannan consistent. Unlike several existing Hannan consistency proofs that rely on concentration of measure results, ours instead uses anti-concentration results from Littlewood–Offord theory.

Keywords: Adaptive heuristics; Learning; Repeated games; Hannan consistency; Fictitious play (search for similar items in EconPapers)
JEL-codes: C73 (search for similar items in EconPapers)
Date: 2018
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Persistent link: https://EconPapers.repec.org/RePEc:eee:gamebe:v:109:y:2018:i:c:p:401-412

DOI: 10.1016/j.geb.2018.01.005

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