Capitalism works fine if it’s regulated either by governments or by workers through unions.

Both at the same time, and the third necessary component - customer associations, three independent forces as a minimum.

EDIT: This is free market, “market” and not “jungle” - because there are regulated rules, “free” - because all participants are free to associate, including association to delegate association choices. “Capitalism” is a bad word because it’s a term for everything from semi-traditional economies to mercantilism to libertarianism, that has interoperability of resources and assets.