@Remi Interesting that Japan seems to have already solved this problem and the solutions have nothing to do with anything in the article.

>There is a town in western Japan named Nagi that’s famous for making babies. Its fertility rate in 2021 was 2.68 lifetime births per woman, compared with 1.3 for Japan as a whole, according to an article in The Wall Street Journal that my Opinion colleague Jessica Grose recently cited. Delegations from elsewhere in Japan and abroad have come to Nagi to learn its secret formula. Is it the free medical care for all children? The affordable child care? The cash gifts to new mothers?

marginalrevolution.com/marginalrevolution/2023/04/fertility-and-mimetic-desire.html