What are the four types of markets recognized by economists?

Economists recognize four primary types of markets: perfect competition, monopolistic competition, oligopoly, and monopoly. Perfect competition features many sellers and buyers with identical products, leading to no single entity controlling the market price. Monopolistic competition involves many sellers offering differentiated products, allowing for some price control. Oligopoly consists of a few dominant firms that can influence prices, while a monopoly is characterized by a single seller controlling the entire market for a product or service.