The quest stands on the blade of a knifehttps://twitter.com/toad_spotted/status/985595288181231616 …
first off, you could have tfr = 1 where 1% of population is (monog, 8kids) and the other 99% is (promisc, <1kid)
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Sure; in actual terms it's unlikely that becoming promiscuous will result in higher fertility now. I'm thinking more in evolutionary psych/ pre-birth control terms; implicitly, Emma Bovary and Anna Karenina would each make less sense to the reader if they had 3 kids instead of 1.
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huh you know i’m getting the sense that you think there is “the one thing” that makes monogamy an ESS and i’m missing entirely what that is
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monogamy= ESS if expected decrease in existing/future expected legitimate offsprings' fitness (divided by two) due to cheating/reduced parental investment>expected increase in the parents' fitness due to cheating. Two or <can't be an ESS because it is below replacement fertility.
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is it possible you’re conflating defecting from a marriage (a 2player game) with defecting from the monogamy-strategy (a n-player coordination game at the population level)?
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i think one feeds into the other
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fair enough but there is a big difference between comparative statics whereby polygamists replace monogamists and “ “ where sustained cooperation becomes impossible and rewards to monogamy fall
End of conversation
New conversation -
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and even if you mean tfr among monogamous couples (only) <2, (a) petitio, (b) see my other comment
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