Indeed. The only way this doesn't happen is that no subgroups continue to reproduce beyond the replacement rate. I think that's highly unlikely. We can see cert

Indeed. The only way this doesn't happen is that no subgroups continue to reproduce beyond the replacement rate. I think that's highly unlikely. We can see certain religious groups in developed countries that have way more than 2.1 children per couple. It seems likely to me that development and education doesn't completely make the problem go away.