Critical Behavior in an Evolutionary Ultimatum Game with Social Structure

Advances in Complex Systems, Forthcoming

Posted: 31 May 2012

See all articles by Claudio J. Tessone

Claudio J. Tessone

ETH Zürich

Víctor M. Eguíluz

Instituto de Física Interdisciplinar y Sistemas Complejos

Date Written: April 2009

Abstract

Experimental studies have shown the ubiquity of altruistic behavior in human societies. The social structure is a fundamental ingredient to understand the degree of altruism displayed by the members of a society, in contrast to individual-based features, like for example age or gender, which have been shown not to be relevant to determine the level of altruistic behavior. We explore an evolutionary model aiming to delve how altruistic behavior is affected by social structure. We investigate the dynamics of interacting individuals playing the Ultimatum Game with their neighbors given by a social network of interaction. We show that a population self-organizes in a critical state where the degree of altruism depends on the topology characterizing the social structure. In general, individuals offering large shares but in turn accepting large shares, are removed from the population. In heterogeneous social networks, individuals offering intermediate shares are strongly selected in contrast to random homogeneous networks where a broad range of offers, below a critical one, is similarly present in the population. Advances in Complex Systems

Keywords: Altruistic behavior, social networks, self-organization

Suggested Citation

Tessone, Claudio J. and Eguiluz, Victor M., Critical Behavior in an Evolutionary Ultimatum Game with Social Structure (April 2009). Advances in Complex Systems, Forthcoming. Available at SSRN: https://ssrn.com/abstract=1504391

Claudio J. Tessone (Contact Author)

ETH Zürich ( email )

Zürichbergstrasse 18
8092 Zurich, CH-1015
Switzerland

HOME PAGE: http://www.sg.ethz.ch/people/tessonec

Victor M. Eguiluz

Instituto de Física Interdisciplinar y Sistemas Complejos ( email )

Palma de Mallorca, 07122
Spain

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