Definition of Evolutionarily stable strategy
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Evolutionarily stable strategy Definition from Science & Technology Dictionaries & Glossaries
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In game theory, behavioural ecology, and evolutionary psychology, an evolutionarily stable strategy (ESS) is a strategy which, if adopted by a population of players, cannot be invaded by any alternative strategy that is initially rare. An ESS is an equilibrium refinement of the Nash equilibrium. It is a Nash equilibrium that is "evolutionarily" stable: once it is fixed in a population, natural selection alone is sufficient to prevent alternative (mutant) strategies from invading successfully.
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