That's precisely my point. There aren't enough people who are capable of being brain surgeons. The majority of us cannot become one. We're just not good enough.

That's precisely my point. There aren't enough people who are capable of being brain surgeons. The majority of us cannot become one. We're just not good enough. That was always the failure of the 'socially necessary labour time' idea. It assumes complete fungibility amongst people, and that isn't the case.