I am willing to work as the CEO of Walmart for say $750k per year. The fact that I don't work there means that either:
1. Voting Walmart shareholders think that the having Doug McMillon for $24M/year is a better deal than having me for $750k/year
2. Voting Walmart shareholders are unaware that reasonably intelligent people with no executive experience are willing to work for a lot less than McMillon.
3. There are other forces at play; e.g. CEOs as Veblen goods or good-old-fashioned corruption. Maybe the board members are also C level employees (at different companies) and they are colluding to keep the C level compensation high.
#2 seems rather unlikely so pick one of #1 and #3.
#1 Certainly does not contradict my use of intentionally, since they believe that McMillon
You also have to consider it's difficult to measure the exact economic value of an employee.
That's true for a single employee, but you don't need to make a profit out of every single employee.
If you do, your CEO will be extremely underpaid in relation to the rest of the market.