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Artificial Life

Summer 2003, Vol. 9, No. 3, Pages 327-334
(doi: 10.1162/106454603322392497)
© 2003 Massachusetts Institute of Technology
Viscous Populations and Their Support for Reciprocal Cooperation
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Viscous populations (those whose members are spatially distributed and have limited mobility and locality of interaction and mating) have been proposed to support the evolution of reciprocal cooperation among self-interested individuals. Here we present a model of such a population and describe how its examination yielded the realization that different classes of viscous populations exist with differing levels of support for reciprocal cooperation. Specifically we find from our model that, in a spatially distributed population with increased viscosity, the reciprocally cooperative tit-for-tat strategy may not be globally stable due to a corresponding increase in local population density.