IB DP Economics - Unit 2 - Perfect competition-Study Notes - New Syllabus
IB DP Economics -Unit 2 – Perfect competition- Study Notes- New syllabus
IB DP Economics -Unit 2 – Perfect competition- Study Notes -IB DP Economics – per latest Syllabus.
Key Concepts:
Update
Perfect Competition (HL)
Many Firms, Free Entry, Homogeneous Products
Perfect competition is a market structure characterized by a large number of small firms, identical products, and no barriers to entry or exit. These features ensure a highly competitive environment where no single firm has control over price.
Perfect competition → No market power → Price takers
1. Many Firms
In perfect competition, there are a large number of firms operating in the market.
Explanation:
- Each firm is very small relative to the total market.
- No single firm can influence the market price.
- Firms are price takers, meaning they accept the price determined by demand and supply.
- If a firm raises its price, consumers will switch to competitors.
Impact:
- Ensures strong competition.
- Prevents firms from exploiting consumers.
- Leads to efficient outcomes.
2. Free Entry and Exit
Free entry and exit means there are no barriers preventing firms from entering or leaving the market.
Explanation:
- New firms can enter when existing firms earn abnormal profit.
- Firms can exit when they incur losses.
- No legal, financial, or technological barriers exist.
Impact:
- Ensures only normal profit in the long run.
- Increases competition in profitable markets.
- Improves efficiency and resource allocation.
3. Homogeneous Products
Homogeneous products means all firms produce identical goods.
Explanation:
- Consumers see products from different firms as perfect substitutes.
- There is no brand loyalty or product differentiation.
- Firms cannot charge higher prices based on uniqueness.
Impact:
- Reinforces the idea of firms being price takers.
- Promotes fair competition.
- Ensures prices reflect market conditions.
Economic Logic (HL Insight):
- Many firms + identical products → no market power.
- Free entry → eliminates abnormal profit in the long run.
- These assumptions lead to allocative and productive efficiency.
Key Point:
- Firms are price takers.
- No barriers to entry or exit.
- Products are identical.
- Highly competitive market structure.
Example 1
Explain why firms in perfect competition are price takers.
▶️ Answer / Explanation
There are many firms in the market, each producing identical products.
No single firm can influence the market price.
If a firm raises its price, consumers switch to other firms.
Thus, firms must accept the market price.
Example 2
Evaluate the importance of free entry in a perfectly competitive market.
▶️ Answer / Explanation
Free entry allows new firms to enter when profits are high.
This increases supply and reduces prices.
It ensures only normal profit in the long run.
However, in reality, barriers often exist.
Thus, free entry is important for competition but may not always be realistic.