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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/32990

Title: Fair and unfair punishers coexist in the Ultimatum Game
Authors: Brañas-Garza, Pablo
Espín, Antonio M.
Exadaktylos, Filippos
Herrmann, Benedikt
Issue Date: 2014
Abstract: In the Ultimatum Game, a proposer suggests how to split a sum of money with a responder. If the responder rejects the proposal, both players get nothing. Rejection of unfair offers is regarded as a form of punishment implemented by fair-minded individuals, who are willing to impose the cooperation norm at a personal cost. However, recent research using other experimental frameworks has observed non-negligible levels of antisocial punishment by competitive, spiteful individuals, which can eventually undermine cooperation. Using two large-scale experiments, this note explores the nature of Ultimatum Game punishers by analyzing their behavior in a Dictator Game. In both studies, the coexistence of two entirely different sub-populations is confirmed: prosocial punishers on the one hand, who behave fairly as dictators, and spiteful (antisocial) punishers on the other, who are totally unfair. The finding has important implications regarding the evolution of cooperation and the behavioral underpinnings of stable social systems.
Sponsorship: FE acknowledges the post-doctorate fellowship granted by the Scientific and Technological Research Council of Turkey (TUBITAK). Financial support from the Spanish Ministry of Science and Innovation (ECO2010-17049), the Government of Andalusia Project for Excellence in Research (P07.SEJ.02547) and the Ramón Areces Foundation (R + D 2011) is gratefully acknowledged.
Publisher: Nature Publishing Group
Keywords: Evolutionary ecology
Human behaviour
URI: http://hdl.handle.net/10481/32990
ISSN: 2045-2322
Citation: Brañas-Garza, P.; et al. Fair and unfair punishers coexist in the Ultimatum Game. Scientific Reports, 4: 6025 (2014). [http://hdl.handle.net/10481/32990]
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