[hias]

I think only very poor countries are overpopulated, because when there is no social security system and you can't save anything for yourself when you get old because you are poor, the only way is to get many children to hope that they will provide for you when you are old.

Rich countries which offer "free" (payed with taxes) social cares like Germany suffer from too many old people and too few children. So you have to offer more benefits for young families to get more children.

If you develop a social security net in poorer countries maybe families will start to get fewer children, because the state will care for you with no exception.