A market structure with many buyers and sellers, freedom of entry, and identical products describes which model?

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

Answer: (C)

Perfect competition describes a market with many buyers and sellers, freedom of entry and exit, and identical products. Because there are so many participants, no single firm can set the price; each is a price taker and must accept the going market price. The identical products mean consumers don’t prefer one seller’s output over another, so competition is driven purely by price and efficiency rather than product differences. Freedom of entry ensures that if firms earn profits, new firms enter and drive profits down to zero in the long run (and losses push firms out). In this setup, the market price is determined by overall supply and demand, and individual firms face a perfectly elastic demand at that price. This leads to efficient resource use, with price reflecting the marginal cost of production in the long run.

In contrast, a monopoly has one seller and barriers to entry, an oligopoly has a few firms influencing each other, and monopolistic competition features many sellers with differentiated products and some price-setting power.