Lesson Overview
Perfect competition represents an idealized market structure where many firms sell identical products, buyers and sellers are price takers, and resources are allocated efficiently.
This lesson examines the characteristics of perfect competition, firm behavior, and short-run and long-run outcomes.
Learning Objectives
- Define perfect competition and its key characteristics.
- Explain why firms are price takers.
- Analyze firm behavior in the short run and long run.
- Understand efficiency outcomes in perfectly competitive markets.
Characteristics of Perfect Competition
- Many buyers and sellers.
- Homogeneous (identical) products.
- Free entry and exit of firms.
- Perfect information for buyers and sellers.
- Firms are price takers — they accept the market price.
Firm Behavior
In perfect competition, firms maximize profit where marginal cost (MC) equals marginal revenue (MR), which equals the market price (P). This determines the optimal output level.
Short-Run Outcomes
- Firms may earn positive, zero, or negative economic profit.
- Firms continue producing as long as P ≥ AVC (average variable cost).
Long-Run Outcomes
- Positive economic profits attract new firms; negative profits cause exits.
- Entry and exit continue until firms earn zero economic profit.
- Resources are allocated efficiently; price equals minimum average total cost.
Efficiency in Perfect Competition
Perfectly competitive markets achieve:
- Allocative efficiency: P = MC, resources go to highest-valued uses.
- Productive efficiency: Firms produce at minimum ATC in the long run.
Practice Questions
- List the five key characteristics of a perfectly competitive market.
- Explain why a firm in perfect competition is a price taker.
- Describe what happens in the long run if firms earn positive economic profit.
Reflection
Think of a real-world example close to perfect competition:
- Identify features that resemble perfect competition.
- Discuss what prevents it from being perfectly competitive.
What’s Next?
In Lesson 2.8: Monopoly & Market Power, we will explore how markets differ when a single firm controls supply and pricing.