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Does mobility decrease cooperation?
Mendeli H Vainstein1, Ana T C Silva, Jeferson J Arenzon
1Instituto de Física and International Center of Condensed Matter Physics, Universidade de Brasília, CP 04513, 70919-97 Brasília DF, Brazil.
Journal of Theoretical Biology
|October 24, 2006
Summary
Mobility in the Prisoner's Dilemma game, even with unconditional strategies, can surprisingly enhance cooperation. This "always-move" rule aids cooperation's emergence and spread, unlike static populations.
Area of Science:
- Evolutionary Game Theory
- Computational Social Science
- Agent-Based Modeling
Background:
- The Prisoner's Dilemma game models social dilemmas where individual rationality conflicts with collective benefit.
- Understanding the emergence of cooperation in populations with simple strategies is a key challenge.
- Spatial distribution and individual movement patterns can significantly influence strategic interactions.
Purpose of the Study:
- To determine the minimal conditions for sustainable cooperation in a spatially distributed population.
- To investigate the impact of unbiased, non-contingent mobility on cooperation dynamics.
- To compare cooperation levels under 'always-move' versus 'never-move' mobility rules.
Main Methods:
- Agent-based simulation of the Prisoner's Dilemma game.
- Utilizing memoryless, unconditional strategies (cooperators and defectors).
- Implementing a non-contingent mobility rule ('always-move') and comparing it to a static ('never-move') scenario.
Main Results:
- Cooperative behavior can be sustained and even enhanced by the 'always-move' mobility rule.
- Mobility increases the potential for cooperation to emerge and invade populations dominated by defectors.
- The 'always-move' rule facilitates cooperation more effectively than the 'never-move' rule.
Conclusions:
- Unbiased mobility is a crucial factor promoting cooperation in spatially structured populations.
- The onset of cooperation can be fundamentally influenced by the introduction of mobility.
- Simple, unconditional strategies can lead to robust cooperation when combined with appropriate mobility patterns.
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