Which scenario is most likely to cause firms to exit a perfectly competitive industry?

• A. Firms experience increasing returns to scale
• B. Market price rises above marginal cost
• C. Market price falls below average total cost for an extended period
• D. Demand for the product increases

Answer: (C)

Verified step by step guidance

1. Understand the concept of firm exit in a perfectly competitive market: Firms exit the industry when they cannot cover their costs in the long run, meaning they are making losses.
2. Recall that in perfect competition, firms produce where price equals marginal cost (P = MC) in the short run, but for long-run equilibrium, price must also cover average total cost (ATC).
3. Analyze each scenario: If firms experience increasing returns to scale, it affects cost structure but does not directly cause exit unless costs are not covered; if market price rises above marginal cost, firms earn profits and will not exit; if demand increases, price tends to rise, encouraging entry rather than exit.
4. Focus on the scenario where market price falls below average total cost for an extended period: This means firms are unable to cover all their costs, leading to sustained losses and incentivizing exit from the industry.
5. Conclude that the most likely cause for firms to exit a perfectly competitive industry is when the market price is below average total cost for a prolonged time, as firms cannot sustain losses indefinitely.