Summary: Journal of Theoretical Biology 244 (2007) 722728
Does mobility decrease cooperation?
Mendeli H. Vainsteina
, Ana T.C. Silvab
, Jeferson J. Arenzonc,Ã
Instituto de Fi´sica and International Center of Condensed Matter Physics, Universidade de Brasi´lia, CP 04513, 70919-97 Brasi´lia DF, Brazil
Departamento de Fi´sica, Universidade Estadual de Feira de Santana, Campus Universita´rio, km 3, BR 116, 44031-460 Feira de Santana BA, Brazil
Instituto de Fi´sica, Universidade Federal do Rio Grande do Sul, CP 15051, 91501-970 Porto Alegre RS, Brazil
Received 25 June 2006; received in revised form 29 August 2006; accepted 8 September 2006
Available online 22 September 2006
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.
r 2006 Elsevier Ltd. All rights reserved.