That’s an interesting question one im probably not the most qualified to answer. US capitalism was always based on prevention of monopolies and cartels (which the diamond industry is) and then a generally hands off approach by the government. Which I generally agree with although someone like Thomas Sowell would argue that even monopolies take care of themselves eventually. Unfortunately it’s been somewhat weakened due to lobbying and subsidies such as for ethanol. US probably has the closest to pure capitalism in the world though, again in my opinion.

I do recommend Sowell’s book basic economics. Its a trudge but its very educational and written in an easy to understand way