Conversation

Are there psychographic studies on what kinds of people have the most children, after controlling for social and economic class and differences attributable to say religious beliefs or access to birth control? Ie what intrinsic traits is modernity selecting for?
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Because I don’t think it correlates strongly to heritable psychographic traits under modern conditions. Religions self-perpetuate memetically these days (conversion). I’m interested in what genes are being selected for.
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Is this of practical interest? It seems likely that exactly what led to having above average fecundity in the environment of 1900 differed from that in 1950 which differed again from that in 2000. Right now the world probably doesn't stand still long enough for it to matter?
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