Regensburg 2007 – scientific programme

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AKSOE: Arbeitskreis Physik sozio-ökonomischer Systeme

AKSOE 8: Economic Models and Evolutionary Game Theory II

AKSOE 8.2: Talk

Tuesday, March 27, 2007, 14:30–15:00, H8

A multi-level selection model for the emergence of social norms — •Francisco Santos — IRIDIA, CoDE, Université Libre de Bruxelles, Brussels, Belgium

We develop a multi-level selection model in the framework of indirect reciprocity[1]. Using two levels of selection, one at the individual level and another at the group level, we propose a competitive scenario among social norms, in which all individuals in each group undergo pairwise interactions, whereas all groups also engage in pairwise conflicts, modeled by different games. Norms evolve as a result of groups* conflicts whereas evolution inside each group promotes the selection of best strategies for each ruling social norm.

Different types of inter-group conflict are considered[2]. The proposed evolutionary model leads to the emergence of one of the *leading eight* social norms, obtained recently by Ohtsuki and Iwasa[3], irrespective of the type of conflict between groups employed. This reputation assignment rule gives rise to a stern and unambiguous response to each individual behavior, where prompt forgiving coexists with implacable punishment.

[1] Chalub, Fabio A. C. C., Santos, F. C., Pacheco, J.M., J Theor Biol 271(2) (2006).

[2] Pacheco, J. M., Santos, F. C., Chalub, F. A. C. C., PLoS Comput. Biol. (in press).

[3] Ohtsuki H, Iwasa Y, J Theor Biol 239(4) (2006).