The Impact of Group Reputation in Multiagent Environments

Baranski, B.¹; Bartz-Beielstein, T.²; Ehlers, R.¹; Kajendran, Th.¹; Kossler, B.¹; Mehnen, J.^{3, a}; Polaszek, T.¹; Reimholz, R.¹; Schmidt, J.¹; Schmitt, K.¹; Seis, D.¹; Slodzinski, R.¹; Steeg, S.¹; Wiemann, N.¹; Zimmermann, M.¹

1)

Lehrstuhl XI, Universität Dortmund, 44227 Dortmund, Germany

2)

Lehrstuhl Informatik VII, Universität Dortmund, Otto-Hahn-Str. 16, 44227 Dortmund

3)

Institut für Spanende Fertigung, Universität Dortmund, Baroper Str. 301, 44227 Dortmund

a) mehnen@isf.de

Kurzfassung

This paper presents results from extensive simulation studies on the iterated prisoner’s dilemma. Two models were implemented: a nongroup model in order to study fundamental principles of cooperation and a model to imitate ethnocentrism. Some extensions of Axelrod’s elementary model implemented individual reputation. We furthermore introduced group reputation to provide a more realistic scenario. In an environment with group reputation the behavior of one agent will affect the reputation of the whole group vice-versa. While kind agents (e.g. those with a cooperative behavior) lose reputation when being in a group, in which defective strategies are more common, agents with defective behavior on the other hand benefit from a group with more cooperative strategies. We demonstrate that group reputation decreases cooperation with the in-group and increases cooperation with the out-group.

Schlüsselwörter

IPD, Cooperation, Group Reputation

Veröffentlichung

In: Proceedings of the IEEE Congress on Evolutionary Computation (CEC 2006), 2006, Vancouver, BC, Canada, Yen, G. G.; et al (Hrsg.), ISBN 0-7803-9487-9, S. 4367-4374