This kind of demographic transitions is not new, something similar happened among the elite in big cities during antiquity (Rome and Greece) Scholars and ruler

This kind of demographic transitions is not new, something similar happened among the elite in big cities during antiquity (Rome and Greece) Scholars and rulers were not happy with the situation. It forced them to offer citizenship to immigrants and slaves on as large scale. It also probably inspired religions that were created at the time to put a strong emphasis on family values and large families. I think we should both rejoice and try to better understand this self-regulating phenomenon.