To the problem of human beings receiving way too much money for the time they spend doing their job?
Easy: crazy taxes. If the company really wants to increase the salary up to some limit, knowing that 95% of that increase will go into taxes, then good for them. Otherwise they can do something else, like increasing other salaries or hiring people.
Also if you ask me, there should be laws for the difference between the lowest and the highest salary in a company. I.e. "the highest salary cannot be more than X times the lowest salary". Which means that if the CEO wants to earn more, they need to raise the lowest salaries.