The better paid your job, the more unique it is, almost by definition: limited supply means the price of labour is higher. Well paid jobs aren't very fungible.

The better paid your job, the more unique it is, almost by definition: limited supply means the price of labour is higher. Well paid jobs aren't very fungible. Even within a single company, people with the same title don't do the same work. And working smarter - aligned with the company goals - still pays much more than longer hours.