I have a suspicion the supply side of this market equation is artificially constrained by people who have an interest (social and financial) in keeping it so, a

I have a suspicion the supply side of this market equation is artificially constrained by people who have an interest (social and financial) in keeping it so, and that is part of why we've seen CEO pay go up so much in the last few decades. There are plenty of people who could do well in the CEO job at most companies—no worse than the average we're getting now, anyway. There are far fewer "CEO types".