A one-child policy is ethically achievable by making the parents rich or otherwise making retirement care a non-concern. If you look at studies, rich people or

A one-child policy is ethically achievable by making the parents rich or otherwise making retirement care a non-concern. If you look at studies, rich people or people who have retirement taken care of are more likely to produce less children. A socialised retirement plan along with a good safety net for those unemployed would likely drive down population massively within a few generations.