The Effect of Group Size and Frequency-of-Encounter on the Evolution of Cooperation

  • Steve Phelps
  • Gabriel Nevarez
  • Andrew Howes
Conference paper

DOI: 10.1007/978-3-642-21314-4_5

Part of the Lecture Notes in Computer Science book series (LNCS, volume 5778)
Cite this paper as:
Phelps S., Nevarez G., Howes A. (2011) The Effect of Group Size and Frequency-of-Encounter on the Evolution of Cooperation. In: Kampis G., Karsai I., Szathmáry E. (eds) Advances in Artificial Life. Darwin Meets von Neumann. ECAL 2009. Lecture Notes in Computer Science, vol 5778. Springer, Berlin, Heidelberg

Abstract

We introduce a model of the evolution of cooperation in groups which incorporates both conditional direct-reciprocity (“tit-for-tat”), and indirect-reciprocity based on public reputation (“conspicuous altruism”). We use ALife methods to quantitatively assess the effect of changing the group size and the frequency with which other group members are encountered. We find that for moderately sized groups, although conspicuous altruism plays an important role in enabling cooperation, it fails to prevent an exponential increase in the level of the defectors as the group size is increased, suggesting that economic factors may limit group size for cooperative ecological tasks such as foraging.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Steve Phelps
    • 1
  • Gabriel Nevarez
    • 2
  • Andrew Howes
    • 2
  1. 1.Centre for Computational Finance and Economic Agents (CCFEA)University of EssexUK
  2. 2.Manchester Business SchoolUniversity of ManchesterUK

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