There are four main types of market structures: perfect competition, monopolistic competition, oligopoly, and monopoly. Perfect competition has the largest number of suppliers. This is because there are no barriers to entry in perfect competition, so any firm can enter the market and become a supplier. Monopolistic competition also has a large number of suppliers, but there are some barriers to entry in this type of market structure. Oligopoly has a small number of suppliers, and monopoly has only one supplier.
