Oligopoly is derived from the Latin ‘olígoi’ – meaning “few”, and ‘pōléō’ – meaning “to sell”. So loosely translated, it means ‘few sellers’. This is a key characteristic of oligopolistic markets as it is defined by a few firms dominating the market.
According to the Collins Dictionary, a free market is an economic system that allows supply and demand to regulate prices, wages, etc, rather than government policy. To be defined as a free market, government must not be involved at any point during the exchange. This means that there is no government intervention, whether in the form of subsidies, tariffs and quotas, or regulation.