🧠 Topic Summary: Long-Run Equilibrium in Perfect Competition
In the world of perfect competition, the "long run" is a fascinating concept where all factors of production are variable, and firms have ample time to enter or exit the market. The core idea is that in the long run, firms in perfectly competitive markets will always earn zero economic profit. This isn't because they're bad at business, but due to the free entry and exit of firms.
If firms are making positive economic profits, new firms will be attracted to the industry, increasing market supply and driving down prices until profits disappear. Conversely, if firms are incurring economic losses, some will exit the market, decreasing supply and raising prices until remaining firms break even. This dynamic ensures that in long-run equilibrium, firms produce at the minimum of their average total cost curve, achieving both allocative efficiency ($P = MC$) and productive efficiency ($P = \text{minimum ATC}$).
📝 Part A: Vocabulary Match-Up
Match the term with its correct definition. Write the letter of the definition next to the term.
- 📈 Perfect Competition: ________
- ⏳ Long-Run Equilibrium: ________
- 💰 Economic Profit: ________
- ⚖️ Allocative Efficiency: ________
- 🛠️ Productive Efficiency: ________
Definitions:
- When a firm's total revenue exceeds its total costs, including both explicit and implicit costs.
- A market structure characterized by many buyers and sellers, identical products, free entry and exit, and perfect information.
- The state where price equals minimum average total cost ($P = \text{min ATC}$), meaning resources are used in the least costly way.
- The state where price equals marginal cost ($P = MC$), meaning resources are allocated to produce the goods most desired by society.
- A market condition in perfect competition where firms earn zero economic profit, and there is no incentive for firms to enter or exit the industry.
✍️ Part B: Fill in the Blanks
Complete the following paragraph using the words provided below. Each word can only be used once.
(Words: economic, exit, enter, zero, supply, price, average total cost)
In a perfectly competitive market, if existing firms are earning positive ________ profit, new firms will be incentivized to ________ the market. This influx of new firms will increase the market ________, causing the market ________ to fall. This process continues until firms are earning ________ economic profit, which occurs when the market price equals the minimum of their ________ curve. Conversely, if firms are incurring losses, they will ________ the market, reducing supply and raising prices until profits return to zero.
🧐 Part C: Critical Thinking
- 🤔 If firms in a perfectly competitive market earn zero economic profit in the long run, why do they continue to operate? Explain the difference between economic profit and accounting profit in your answer.