Algorithms may not learn to play a unique Nash equilibrium

Takako Fujiwara-Greve and Carsten Krabbe Nielsen
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Carsten Krabbe Nielsen: Catholic University of Milan

Journal of Computational Social Science, 2021, vol. 4, issue 2, No 17, 839-850

Abstract: Abstract There is a widespread hope that, in the near future, algorithms become so sophisticated that “solutions” to most problems are found by machines. In this note, we throw some doubts on this expectation by showing the following impossibility result: given a set of finite-memory, finite-iteration algorithms, a continuum of games exist, whose unique and strict Nash equilibrium cannot be reached from a large set of initial states. A Nash equilibrium is a social solution to conflicts of interest, and hence finite algorithms should not be always relied upon for social problems. Our result also shows how to construct games to deceive a given set of algorithms to be trapped in a cycle without a Nash equilibrium.

Keywords: Algorithm; Learning; Nash equilibrium; Impossibility (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1007/s42001-021-00109-9

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