Is a political and economic system ethical if it allows for the creation of billionaires alongside the underserved and impoverished?

RMP Economic Justice p. 581-612 – also ensure you read the political debate re: AOC’s billionaire comment. https://www.salon.com/2019/01/22/as-usual-alexandria-ocasio-cortez-is-right-there-should-be-no-billionaires/ https://www.businessinsider.com/alexandria-ocasio-cortez-thinks-billionaires-shouldnt-exist-2019-1