Those are downstream of housing restrictions to a large extent. From "Housing theory of everything" [0]:
Consider a cleaner living in Alabama. In 1960 they could move to NYC and earn wages 84% higher, and still end up with 70% higher income after rent. In 2010, they could move to New York City and become 28% more productive, and earn a wage 28% higher – and reduce the surplus of workers back home, letting them demand higher pay. But since housing costs are so much higher, the net earnings and living standards of someone like this would fall if they moved today, and wouldn’t be worth it. The same would be true for plumbers, receptionists and other professions that allow other people to specialise at what they’re best at and minimise the time they spend on things like DIY and answering the phone. By contrast, top lawyers get wage boosts that are still sufficiently higher to justify a move in both 1960 and 2010, even after the higher rents they’ll have to pay.
[0] https://worksinprogress.co/issue/the-housing-theory-of-every...