I'm not aware of capitalism requiring that the participants in capitalism shouldn't form a monopoly or need to maintain free markets. In order for capitalism to be sustainable for a long period of time, it requires an external force, like a government, to regulate it to keep it from destroying itself.
In a capitalist economic system, the point of capital is to be used to amass more capital.
@finner No. It could be hard to find an economist that holds that definition of capitalism. The wiki page actually has a pretty reasonable definition.
'The defining characteristics of capitalism include private property, capital accumulation, competitive markets, price systems, recognition of property rights, self-interest, economic freedom, meritocracy, work ethic, consumer sovereignty, economic efficiency, decentralized decision-making, profit motive, a financial infrastructure of money.. Etc'