I’d like to see such a rule, but doubt that there won’t be any loopholes to circumvent it. You can already see some of those in sports. There are a lot of stories on how clubs “dealt” with financial fair play in european football and I heard rumors of a similar thing with the american salary cap too.

Just some ideas:

• ridiculously long contracts with “fair” pay
• managers are working for a seperate company that only contains managers
• seperate overpayed contracts for a none existing job
• material/service based rewards like private jets

All in all good luck with finding a politician pushing this through (most lf the are exactly in those positions) and finding all the loopholes. Rich people can pay a lot of experts to become even richer