People…die?
A couple needs to have 2.1 kids just to *maintain* the population. Because that couple will die so they need to make two people simply to replace themselves.
In developed countries less than half of all couples have 3 kids. Which means less than half of all couples even manage to do more than replace themselves.
As an anecdote of the roughly 30 or so families of kids I was in grade school with only 6 of them came from a family with more then two kids. There were more families with a single child.
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