Why do oligopolies exist. List five or six oligopolist whose products you own or regularly purchase what distingushes oligopoly from monopolistic comprtion?

Oligopolies exist due to high barriers to entry, such as significant capital requirements and economies of scale, which limit the number of firms in a market. Additionally, established companies may engage in strategic behavior, such as price-setting and non-price competition, to maintain their market positions. Examples of oligopolists whose products many people might regularly purchase include Coca-Cola, Nike, Ford, Samsung, and Intel. Oligopoly is distinguished from monopolistic competition by the few firms in the market that dominate pricing and output decisions, as opposed to many firms that compete on price and product differentiation in monopolistic competition.