I was challenging the fact that, as you say : "Labor is a market like any other.". I don't think it is like that because behind each job there's a life.

Moreover, on the fact that engineers and sales persons should have the same salaries, yep that's what I think. I don't see why sales works should be more compensated. I understand that the way it is compensated (bonus for sales) is the way it works, but in the end, I don't see why it should pay more than engineering (here I consider a context where the sales person and the engineer are both employees).

The two roles are equally important to me, just different skills.

Labor is a market. It's a shockingly inefficient one, but it's definately a market.