It's helpful to think of the USA as a gigantic factory that produces billionaires. The manufacturing process runs off of energy ("money") provided by banks, investors and government, and the raw materials that get consumed and discarded are the lives and livelihoods of workers, and the end product that pops off the assembly line is "wealthy people".
The options aren't limited to authoritarian dictatorship and capitalist oligopoly.
In the same vein it isn't communist to suggest that billionaires should maybe remain slightly smaller billionaires in order to provide workers a decent quality of life.
Until fairly recently you could support a household on one income in most western countries. We're now seeing people struggling on two after decades of tax cuts and historically low tax burdens on the extremely wealthy.
