LEARNING, EVOLUTION AND POPULATION DYNAMICS

Jürgen Jost and Wei Li ()
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Jürgen Jost: Max Planck Institute for Mathematics in the Sciences, Inselstr. 22, 04103 Leipzig, Germany
Wei Li: Max Planck Institute for Mathematics in the Sciences, Inselstr. 22, 04103 Leipzig, Germany

Advances in Complex Systems (ACS), 2008, vol. 11, issue 06, 901-926

Abstract: We study a complementarity game as a systematic tool for the investigation of the interplay between individual optimization and population effects and for the comparison of different strategy and learning schemes. The game randomly pairs players from opposite populations. It is symmetric at the individual level, but has many equilibria that are more or less favorable to the members of the two populations. Which of these equilibria is then attained is decided by the dynamics at the population level. Players play repeatedly, but in each round with a new opponent. They can learn from their previous encounters and translate this into their actions in the present round on the basis of strategic schemes. The schemes can be quite simple, or very elaborate. We can then break the symmetry in the game and give the members of the two populations access to different strategy spaces. Typically, simpler strategy types have an advantage because they tend to go more quickly toward a favorable equilibrium which, once reached, the other population is forced to accept. Also, populations with bolder individuals that may not fare so well at the level of individual performance may obtain an advantage toward ones with more timid players. By checking the effects of parameters such as the generation length or the mutation rate, we are able to compare the relative contributions of individual learning and evolutionary adaptations.

Keywords: Evolutionary complementarity game; individual learning; population dynamics; evolutionary adaptation (search for similar items in EconPapers)
Date: 2008
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DOI: 10.1142/S0219525908001908

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