She's saying nobody can truly work a billion times more, a billion times harder, a billion times smarter, so nobody can actually earn a billion dollars.
Given that, how can some people be worth as much? There has to be some capture of wealth somewhere such that even though nobody can actually earn as much, they can be worth as much.
Given that, how can some people be worth as much? There has to be some capture of wealth somewhere such that even though nobody can actually earn as much, they can be worth as much.