Comment by echelon
Capitalism is a great model that results in evolutionary pressures for the efficient development of goods and services.
One failure mode of unchecked and unregulated capitalism is the establishment of monopolies that can starve oxygen from the rest of the ecosystem.
In order to have maximally efficient and broadly beneficial capitalism, you need strong anti-trust mechanisms to reoxygenate the environment for new competition. Regular enforcement also means that labor and investment capital reap the most rewards instead of calcified, legacy incumbents.
Companies need to be constantly fighting to survive. If they're sitting comfortable and growing without controls, something went wrong and the rest of the fitness landscape is being distorted by an invasive species.
Antitrust Regulation is incredibly pro-market and pro-competition.
Mercantile capitalism was regulated and under the power of colonizer states though. The East India Company had to follow the British Crown orders, as were the different transatlantic companies. The competition was mostly between nation-state rather than between companies. Actually, China started consolidating its industry and "Capitalism with chineese characteristic" look a lot like modern mercantile capitalism.