Americans are world leaders among chemists, so I don't think you're correct in this case [1].
It looks much more like saturation, with only 7200 openings per year [2]. And over 13000 annual graduates [3].
We have an excess of chemists in the US, as best I can tell, and we should expect pay to reflect that.
[1] https://research.com/news-events/world-ranking-of-top-chemis...
[2] https://www.bls.gov/ooh/life-physical-and-social-science/che...
[3] https://cen.acs.org/education/graduate-education/numbers-s-c...
Child care labor is in fact in low demand [2].
I think child care is expensive because insurance is expensive.
[1]: https://www.bls.gov/ooh/Life-Physical-and-Social-Science/Phy...
[2]: https://www.bls.gov/ooh/personal-care-and-service/childcare-...
The issue is that tech can pay exorbitant salaries compared to physical-world companies as the product they're producing has infinite reach and is often 'evergreen'
It's the same issue as investment banking; when you can almost literally print the money you're paying salaries with you can hire everyone at any price.
The issue is, that leads to the smartest people in the country all ending up at 'virtual' industries and you discover eventually you don't have an economy, you just have a giant video game.
(What we’re seeing now)