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J Theor Biol. 2007 Feb 21;244(4):722-8. Epub 2006 Sep 22.

Does mobility decrease cooperation?

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Instituto de Física and International Center of Condensed Matter Physics, Universidade de Brasília, CP 04513, 70919-97 Brasília DF, Brazil.


We explore the minimal conditions for sustainable cooperation on a spatially distributed population of memoryless, unconditional strategies (cooperators and defectors) in presence of unbiased, non-contingent mobility in the context of the Prisoner's Dilemma game. We find that cooperative behavior is not only possible but may even be enhanced by such an "always-move" rule, when compared with the strongly viscous ("never-move") case. In addition, mobility also increases the capability of cooperation to emerge and invade a population of defectors, what may have a fundamental role in the problem of the onset of cooperation.

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