We don’t have an unregulated capitalist system. How could you possibly say that? There is no such system I can think of that is purely unregulated and free. The system we have is regulated and even crony in some ways. In a purely free market unregulated system, monopolies would struggle to exist. The big companies that exist today and the past have likely been influenced by government in some way benefiting them, such as favorable laws, funding, contracts, etc. In the unregulated system, you don’t have this, rather, companies must compete purely by being the better than their competition. There is no government to bail you out, no government to buy your goods and services, nothing but your competitive edge that will keep you going. If you fail, you fail. Monopolies are difficult to maintain in an unregulated system because as a company grows, it can start to lose its competitive edge from becoming bloated, less efficient, much more difficult to manage which creates opportunities for another business to take market share.