Regensburg 2004 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
AKSOE: Physik sozio-ökonomischer Systeme
AKSOE 4: Soziale Systeme und Entscheidungsmodelle I
AKSOE 4.3: Talk
Tuesday, March 9, 2004, 11:00–11:30, H8
Invasion of Cooperation in Heterogeneous Populations — •Frank Schweitzer1,2 and Laxmidhar Behera1,3 — 1Fraunhofer Institut for Autonomous Intelligent Systems, Schloss Birlinghoven, D-53754 Sankt Augustin — 2Institute of Physics, Humboldt University, Newtonstraße 15, D-12489 Berlin — 3Department of Electrical Engineering Indian Institute of Technology, Kanpur, 208 016, India
We consider a population of agents interacting in an iterated prisoner’s dilemma (IPD) game. Using a one-step memory agents can play different strategies, thus the population becomes heterogeneous. Further it is assumed that after each generation agents adopt another strategy proportional to the relative performance (average payoff) of the respective strategy. We investigate under which conditions a stable coexistence of subpopulations playing different strategies can be found and how this depends on the number of interactions within each generation. We further discuss a model where agents are spatially separated on different “islands” and are allowed to migrate after each generation. Here we find a critical migration rate at which e.g. an island dominated by non-cooperating agents can be transformed into a cooperative one. Thus, optimal (im)migration may enhance cooperation!