Recent evolutionary models have introduced 'small mutation rates' as a way of refining predictions of long-run behavior. The authors show that this refinement effect can only be obtained by restrictions on how the magnitude of the effect of mutation on evolution varies across states of the system. In particular, given any model of the effect of mutations, any invariant distribution of the 'mutationless' process is close to an invariant distribution of the process with appropriately chosen small mutation rates. Copyright 1996 by The Econometric Society.
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Article provided by Econometric Society in its journal Econometrica.
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