There’s plenty of economy scale to having more children. The bare necessities scale quite rapidly with sleeping space (one more bed costs less than one more roo

There’s plenty of economy scale to having more children. The bare necessities scale quite rapidly with sleeping space (one more bed costs less than one more room) and large pot cooking (one trip to the store and buying in bulk). Most children’s clothing can be handed down to at least one other child. The child rearing also scales when you have a single earner family unit as even the stay at home parent’s eyeballs can be shared. And after a few years the older children themselves provide some of that as well. What doesn’t scale are things we used to consider luxuries. Plane tickets, paid summer camps, or private school tuition. I think it’s more selfishness on the part of higher income earners than anything else that prevents them from having more children. Both in time commitments and the thought of having to give up or pare down an expensive vacation.