A discrete dynamical system for the greedy strategy at collective Parrondo games

Details A discrete dynamical system for the greedy strategy at collective Parrondo games A discrete dynamical system for the greedy strategy at collective Parrondo games

2010-11-08

arxiv.org/abs/1011.1773v3

Dynamical Systems 26 (2011) 401-424

Mathematics

Probability

29 pages, 3 figures. Condensed from v2. Minor title change

Scientific paper

We consider a collective version of Parrondo's games with probabilities parametrized by rho in (0,1) in which a fraction phi in (0,1] of an infinite number of players collectively choose and individually play at each turn the game that yields the maximum average profit at that turn. Dinis and Parrondo (2003) and Van den Broeck and Cleuren (2004) studied the asymptotic behavior of this greedy strategy, which corresponds to a piecewise-linear discrete dynamical system in a subset of the plane, for rho=1/3 and three choices of phi. We study its asymptotic behavior for all (rho,phi) in (0,1)x(0,1], finding that there is a globally asymptotically stable equilibrium if phi<=2/3 and, typically, a unique (asymptotically stable) limit cycle if phi>2/3 ("typically" because there are rare cases with two limit cycles). Asymptotic stability results for phi>2/3 are partly conjectural.

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