There are two approaches:
- limit the ratio to within the company
- have the ratio based on minimum wage
I feel the first approach may be the better solution to start with, since this is an environment where a CEO controls the wage scale. If the CEO wants more money, then they would have to consider how much the staff is being paid and how to boost things overall. This means that they can't tell the staff there is no money, while allocating themselves more if the pie. If they can't afford to raise pay overall, then maybe they need to see how they are running the company. If they can only pay people more short term, then give them a bonus, since that does not need to be maintained the next year.
The second approach is a bit more complicated, since a company may be performing well, while the rest of the economy is not doing so well. There is a risk that even a non CEO in a successful company may pass the 20:1 ratio?