I think having stronger employee rights such that a company's leadership can't increase their own compensation disproportionately to that of the average employee. A CEO earning 350x the average worker in their company suggests that the worker isn't benefitting from the company's success the same way the boss is, despite them driving the company's value through their labour.
There's nothing inherently being wrong with a billionare, it's the gulf between the median income and their own that is a problem, so making an effort to prevent such people enriching themselves at the expense of increasing their staff's pay might help with that.
As it stands, workers don't have as much rights as they require, so the balance is skewed heavily away from them and towards an absolute minority of wealthy people.
There's nothing inherently being wrong with a billionare, it's the gulf between the median income and their own that is a problem, so making an effort to prevent such people enriching themselves at the expense of increasing their staff's pay might help with that.
As it stands, workers don't have as much rights as they require, so the balance is skewed heavily away from them and towards an absolute minority of wealthy people.