>>270364>>270365To make an example why that difference matters, the most prominent example of an oligarchy would be modern russia. However, modern russia isn't capitalist in the same way the US or other western countries are. In the US, you had a small number of people becoming insanely rich, so rich that they can influence policy to become even richer, which is more economically efficient than actually investing in improving your business, but over time this degrades the country as a free market economy.
In russia, russia was run by the secret service, the KGB. When the soviet union collapsed, what happened was that individuals from the KGB simply took control of various state industries - not business men, but basically gangsters. They did this by for example auctioning off things in an unannounced auction at 3AM in the wilderness. So only the people who knew about it - were part of this KGB clique - would be able to "buy" it at this auction for the price of a loaf of bread.
That is an oligarchy. Not businessmen with too much money, but essentially gangsters who use even more underhanded tactics to retain control.