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Unexploitable games and unbeatable strategies

IEEE Access Volume 11 Page 5062-5068
published_at 2023-01-10
Title
Unexploitable games and unbeatable strategies
Abstract
Imitation is simple behavior which uses successful actions of others in order to deal with one’s own problems. Because success of imitation generally depends on whether profit of an imitating agent coincides with those of other agents or not, game theory is suitable for specifying situations where imitation can be successful. One of the concepts describing successfulness of imitation in repeated two-player symmetric games is unbeatability. For infinitely repeated two-player symmetric games, a necessary and sufficient condition for some imitation strategy to be unbeatable was specified. However, situations where imitation can be unbeatable in multi-player games are still not clear. In order to analyze successfulness of imitation in multi-player situations, here we introduce a class of totally symmetric games called unexploitable games, which is a natural extension of two-player symmetric games without exploitation cycles. We then prove that, for infinitely repeated unexploitable games, there exist unbeatable imitation strategies. Furthermore, we also prove that, for infinitely repeated non-trivial unexploitable games, there exist unbeatable zero-determinant strategies, which unilaterally enforce some relationships on payoffs of players. These claims are demonstrated in the public goods game, which is the simplest unexploitable game. These results show that there are situations where imitation is unbeatable even in multi-player games.
Creators Ueda Masahiko
[e_rad]00826571
Affiliate Master Yamaguchi University
[kakenhi]15501 grid.268397.1
Source Identifiers [EISSN] 2169-3536
Creator Keywords
Imitation strategies repeated games unbeatable strategies zero-determinant strategies
Languages eng
Resource Type journal article
Publishers IEEE
Date Issued 2023-01-10
Rights
Creative Commons.Atrtribution 4.0 International(https://creativecommons.org/licenses/by/4.0/)
File Version Accepted Manuscript
Access Rights metadata only access
Relations
[isVersionOf] 10.1109/ACCESS.2023.3235922
Funding Refs
Japan Society for the Promotion of Science [crossref_funder]https://doi.org/10.13039/501100001691
Award Economic theory of information markets based on information science 20K19884
Funding Refs
Inamori Foundation
Award