I have a different take on it altogether. Religion previously worked as a sort of philosophical compass for life. It provided meaning and purpose, but as society has largely left religion behind, this left a void that was never really cleanly filled. So then in a post-religion society, what becomes the purpose in life? And I think for many, they simply have grabbed the lowest hanging fruit, even if subconsciously - wealth and materialism. And in this worldview there's not much room for children.
I think my little hypothesis here works to cleanly explain fertility crises much better than any other alternative. For instance the typical income:fertility hypothesis or education:fertility hypothesis both have endless glaring counter-examples like Thailand where the society is relatively poor with relatively low education, yet has a fertility rate now lower than even Japan.
It also explains the paradox of upper middle class couples claiming that they aren't having children because they don't have enough money, while lower income couples continue to have relatively healthy fertility rates, and it's for the same reason that extremely high income couples have relatively healthy fertility rates. Extremes of high and low income largely exclude one from materialism simply because there's no carrot to chase, whether because you can have it at any time you want, or simply because it's so far away that there's no hope of ever getting closer to it.
I think my little hypothesis here works to cleanly explain fertility crises much better than any other alternative. For instance the typical income:fertility hypothesis or education:fertility hypothesis both have endless glaring counter-examples like Thailand where the society is relatively poor with relatively low education, yet has a fertility rate now lower than even Japan.
It also explains the paradox of upper middle class couples claiming that they aren't having children because they don't have enough money, while lower income couples continue to have relatively healthy fertility rates, and it's for the same reason that extremely high income couples have relatively healthy fertility rates. Extremes of high and low income largely exclude one from materialism simply because there's no carrot to chase, whether because you can have it at any time you want, or simply because it's so far away that there's no hope of ever getting closer to it.