Japanese women in particular can be locked out of career growth once they are married. The expectation is that after they get married they will quit their job a

Japanese women in particular can be locked out of career growth once they are married. The expectation is that after they get married they will quit their job and become a housewife. Add that to the issue that having children out of wedlock is frowned upon, and you get less people having children. Make it so women can have both children and a prosperous career and you'll fix the fertility issue.