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Quantifying fairness to overcome selfishness: A behavioural model to describe the evolution and stabilization of inter-group bias using the Ultimatum Game

1 University of Florence, Department of Education, Languages, Intercultures, Literatures and Psychology, Via di San Salvi, 12, Building 26, Florence, Italy
2 University of Florence Department of Physics and Astronomy. Also INFN, Sez. Firenze. Via G. Sansone 1, 50019 Sesto Fiorentino, Italy
3 University of Florence, Center for Study of Complex Dynamics (CSDC), Florence, Italy
4 Department of Mathematics “Giuseppe Peano”, University of Turin, via Carlo Alberto 10, 10123 Torino, Italy; Member of the INdAM research group GNCS

Special Issues: Mathematical Modeling to Solve the Problems in Life Sciences

The ability to form groups to overcome problems has been crucial for the evolution of human beings. To favour the formation of cooperating groups, one of the mechanisms developed is the inter-group bias, namely the tendency of individuals to favour members of their group and hinder the external ones. It is the cognitive equivalent of the “green beard effect” in evolutionary biology, introduced by Hamilton and popularized by Dawkins, for which a group can profit of the altruistic be-haviour of its members. Here, we use a behavioural model based on the Ultimatum Game, to shed ligh on how this behaviour cloud has been stabilized in the human population, estimating the magnitude of favouritism needed to overcome selfish individuals. Through both numerical simulations and analytic approaches, we study how a community of collectivist and individualist agents evolves. The key factor is the mechanism for the evolution of the population, i.e., the replacement of the poor-performing in-dividuals. In the case of replacement by the reproduction of existing individuals, we observe a smooth phase transition and no coexistence. If the replacement is random, the transition smooths, and coex-istence is possible. We developed analytical approaches for these two cases and performed numerical simulations. Although analytical calculations support the behaviour emerging from simulations, some differences ask for more refined treatments.
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Keywords Inter-group favouritism; fairness; selfishness; agent-based modeling; Ultimatum Game; evolution; mathematical models; dynamical systems

Citation: Andrea Guazzini, Enrico Imbimbo, Federica Stefanelli, Franco Bagnoli, Ezio Venturino. Quantifying fairness to overcome selfishness: A behavioural model to describe the evolution and stabilization of inter-group bias using the Ultimatum Game. Mathematical Biosciences and Engineering, 2019, 16(5): 3718-3733. doi: 10.3934/mbe.2019184

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