This is a great post. I knew that at the top end of the income distribution in the US people have more kids, but didn’t understand how robust the relationship seems to be.
I think the standard evbio explanation here would ride on status—people at the top of the tribe can afford to expend more resources for kids, and also have more access to opportunities to have kids. That would predict that we wouldn’t see a radical change as everyone got more rich—the curve would slide right and the top end of the distribution would have more kids but not necessarily everyone else.
But the gdp per capita graphs I think are evidence against that view. It looks like the curve is a lot flatter than when fertility is rising than when it’s dropping, but if this holds into the future I really don’t worry too much. We’re on the cusp of all getting a lot richer, or else AI will kill us all anyway.
This is a great post. I knew that at the top end of the income distribution in the US people have more kids, but didn’t understand how robust the relationship seems to be.
I think the standard evbio explanation here would ride on status—people at the top of the tribe can afford to expend more resources for kids, and also have more access to opportunities to have kids. That would predict that we wouldn’t see a radical change as everyone got more rich—the curve would slide right and the top end of the distribution would have more kids but not necessarily everyone else.
But the gdp per capita graphs I think are evidence against that view. It looks like the curve is a lot flatter than when fertility is rising than when it’s dropping, but if this holds into the future I really don’t worry too much. We’re on the cusp of all getting a lot richer, or else AI will kill us all anyway.