I wouldn't even go as high as $1B. That cap should be tied to a person's life expectancy. The older they are, the less money they'll need to live the rest of their lives.

I also think we need to cap annual income, and limit the highest salary within a company to some reasonable multiple of the lowest salary in that company.

And get rid of the stock market, which is nothing more than a casino.

Of course, none of that will happen in my lifetime.