Yes, when you focus on the costs of raising kids, which are high today. But they weren't always as high, especially not the marginal costs of one more kid.
Also, the key point is that when people's wealth are based mainly on work actually getting done, as on a farm with room to expand, then you get richer with more kids. It's when access to capital becomes more important - including as land becomes expensive - that you get poorer with more kids.
Also, the key point is that when people's wealth are based mainly on work actually getting done, as on a farm with room to expand, then you get richer with more kids. It's when access to capital becomes more important - including as land becomes expensive - that you get poorer with more kids.