In a perfect competition, the market price is determined by_______

Analyze the question The question asks who or what sets the market price under perfect competition. Option D has a typo: "junctions" should be "functions", meaning the market supply and demand functions (curves).

Explain the concept Perfect competition has these features:

• Many buyers and many sellers
• Homogeneous (identical) products
• Free entry and exit
• Perfect knowledge of the market

Because there are so many small firms, no single producer or consumer can influence the price. Each firm is a price taker. The price is set by the interaction of total (market) supply and total (market) demand.

Step-by-step solution

1. Government (A): The government does not set price in a perfectly competitive market. Price controls, such as a price ceiling, are interventions that depart from perfect competition.
2. Producer (B): One producer is too small to change the market price. If they charge more, buyers go to other sellers of the identical product.
3. Consumer (C): One consumer is also too small to affect the price. Buyers are price takers too.
4. Market supply and demand (D): The equilibrium price is where the market demand curve meets the market supply curve. This is the price that applies to everyone in the market.

Correct answer: D, the market supply and demand "functions" (curves).

Exam tip Remember: "Perfect competition = price taker." The firm accepts the price from the market, and the market price comes from the forces of demand and supply. A monopolist, by contrast, is a price maker. If you see "perfect competition" with a price question, think "market forces."