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Structural power and the evolution of collective fairness in social networks

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  • Fernando P Santos
  • Jorge M Pacheco
  • Ana Paiva
  • Francisco C Santos

Abstract

From work contracts and group buying platforms to political coalitions and international climate and economical summits, often individuals assemble in groups that must collectively reach decisions that may favor each part unequally. Here we quantify to which extent our network ties promote the evolution of collective fairness in group interactions, modeled by means of Multiplayer Ultimatum Games (MUG). We show that a single topological feature of social networks—which we call structural power—has a profound impact on the tendency of individuals to take decisions that favor each part equally. Increased fair outcomes are attained whenever structural power is high, such that the networks that tie individuals allow them to meet the same partners in different groups, thus providing the opportunity to strongly influence each other. On the other hand, the absence of such close peer-influence relationships dismisses any positive effect created by the network. Interestingly, we show that increasing the structural power of a network leads to the appearance of well-defined modules—as found in human social networks that often exhibit community structure—providing an interaction environment that maximizes collective fairness.

Suggested Citation

  • Fernando P Santos & Jorge M Pacheco & Ana Paiva & Francisco C Santos, 2017. "Structural power and the evolution of collective fairness in social networks," PLOS ONE, Public Library of Science, vol. 12(4), pages 1-14, April.
  • Handle: RePEc:plo:pone00:0175687
    DOI: 10.1371/journal.pone.0175687
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    1. Fischbacher, Urs & Fong, Christina M. & Fehr, Ernst, 2009. "Fairness, errors and the power of competition," Journal of Economic Behavior & Organization, Elsevier, vol. 72(1), pages 527-545, October.
    2. Guth, Werner & Schmittberger, Rolf & Schwarze, Bernd, 1982. "An experimental analysis of ultimatum bargaining," Journal of Economic Behavior & Organization, Elsevier, vol. 3(4), pages 367-388, December.
    3. Hessel Oosterbeek & Randolph Sloof & Gijs van de Kuilen, 2004. "Cultural Differences in Ultimatum Game Experiments: Evidence from a Meta-Analysis," Experimental Economics, Springer;Economic Science Association, vol. 7(2), pages 171-188, June.
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