It's popular opinion, but it's demonstrably wrong. In terms of procreation richer countries doesn't do better, richer communities doesn't do better, and while economic incentives may shift needle a little temporarily, so far no consistent effects have been shown with them. Since condoms/pills/abortion detached sexual intercourse from its original biological function, it's only ideals, and culture which make people to choose becoming parents. It's too big a part of life to be paid with money for if you simply don't want it.