The way I like to think about it all labor is a product each one of us can sell, the less skillful and educated for said skill the less demand there is for it. Now, what happens when a product is artificial increases the cost of a product? Fewer people buy it (exemplified in the cigarette and gas taxes).
P.S. Sorry for the late response I've been busy with some Nazi trolls and haven't been sleeping well and wasn't in the mood to be dogpiled.
Yes, labor is our capital. But I think in the US, it is an undervalued form of capital, looking at the increasing gap between the salaries of workers and CEOs in this country.
From the Economic Policy Institute
https://www.epi.org/publication/ceo-compensation-surged-14-in-2019-to-21-3-million-ceos-now-earn-320-times-as-much-as-a-typical-worker/#:~:text=In%202019%2C%20the%20ratio%20of,in%20the%20top%200.1%25).
320 times??? Or, realistically, more?
That is neither fair nor worthy. And the burger flipper's low wage keeps him or her chained to the grill, because they have to work so much harder to earn a living, which keeps them from developing all the other skills they might -- and that's a hidden productivity tax on the whole society.
In most cases, good employees are promoted to a better-paid rank or get a promotion if they are not they'll leave or get recruited by the completion. Like you said if the employee has other skills such as leadership skills they may be promoted to assistant manager or restaurant manager...etc.