Which market structure is described by many buyers and sellers, identical products, and no barriers to entry, and is not observed in the real world?

• A. Monopoly
• B. Oligopoly
• C. Perfectly Competitive Market
• D. Monopsony

Answer: (C)

Many buyers and sellers, identical products, and no barriers to entry describe a perfectly competitive market. In this setting, no single buyer or seller can influence the price because each firm’s product is the same as every other firm’s, so buyers are free to switch suppliers without any loss of value. With no obstacles to entry or exit, new firms can enter when profits appear and existing firms can leave if profits disappear, which tends to push the price down to the level of the marginal cost and drives resources toward their most efficient use.

In the real world, this exact setup is rare. Markets usually have some product differentiation, some firms with more ability to set or influence prices, and barriers to entry such as startup costs, brand loyalty, or regulations. That’s why perfect competition serves as a theoretical benchmark rather than a typical actual market.

Other market structures describe different configurations: a monopoly involves a single seller, an oligopoly involves a few large sellers, and a monopsony involves a single dominant buyer.