Instead of a static number, you just make it a multiple of the minimum wage. Say, the upper limit is 500 x Minimum Wage x Full Time working hours, or right now about $15.6 million. If you have enough for a person to live 5 lifetimes, then you have enough for you and your family. If you feel that’s not enough, maybe the minimum wage needs improving.
Instead of a static number, you just make it a multiple of the minimum wage. Say, the upper limit is 500 x Minimum Wage x Full Time working hours, or right now about $15.6 million. If you have enough for a person to live 5 lifetimes, then you have enough for you and your family. If you feel that’s not enough, maybe the minimum wage needs improving.