The Muslims in my city seem to have no problem raising large families in a urban environment despite having less financial resources than the other cultural groups, so the explanation cannot be entirely economic. Culture and religion seem to play a very important part

The thing is, in our culture it's no loger cool to dedicate your life to selling doner kebabs. Pur definition of success includes high skills and specialization. That produced the society that attracts immigrants and that can't be reproduced back where they came from.

But it also puts high price tag on children.