Fertility rates and household income are inversely correlated (poor people have more children). As are fertility rates and IQ (smarter people follow k-selected reproduction and put a lot of parental time and resources into a few children rather than little effort into lots of children).
Fertility rates and household income are inversely correlated (poor people have more children). As are fertility rates and IQ (smarter people follow k-selected reproduction and put a lot of parental time and resources into a few children rather than little effort into lots of children).
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