Which market structure is characterized by many firms with differentiated products and free entry?

• A. Monopolistic competition
• B. Monopoly
• C. Oligopoly
• D. Perfect competition

Answer: (A)

Many firms with differentiated products and free entry describe monopolistic competition. In this setup, each firm offers a unique version of a broadly similar product, so it faces a downward-sloping demand and can set its own price to some extent. Yet because entry and exit are easy, profits attract new competitors, shifting demand away from each firm and pushing profits to zero in the long run. This combination means firms have some market power in the short run, but no sustained profits overall.

This differs from a monopoly (one seller with high barriers to entry and substantial market power), an oligopoly (a few large, interdependent firms), and perfect competition (many firms with identical products and price-taking behavior, leading to zero profits in the long run).