In a perfectly competitive market, a single firm's price is determined by

• A. government regulations
• B. the average cost of production
• C. the sum of individual firm desires
• D. market-determined price where individual firms are price takers

Answer: (D)

In a perfectly competitive market, no single firm can influence the price because many buyers and sellers trade identical products. The price is set by the overall intersection of market supply and market demand, and each firm takes that market price as given. If a firm tried to set its own price higher, buyers would switch to competitors; if it set it lower, it would sell out instantly without gaining market power. This is why the description that best fits is a market-determined price where individual firms are price takers. Other options imply government control, pricing tied to costs, or pricing driven by the desires of firms, which doesn’t align with how price-taking firms operate in perfect competition.