market failure externalities
Overview
This lesson explores externalities, a crucial form of market failure where the production or consumption of a good or service imposes costs or benefits on third parties not directly involved in the transaction. Understanding externalities is essential for analysing why free markets may not achieve socially optimal outcomes and for evaluating potential government interventions.
Introduction to Externalities and Market Failure
Market failure occurs when the free market mechanism fails to achieve an efficient allocation of resources, meaning that society's welfare is not maximised. Externalities are a primary cause of market failure. An **externality** arises when the production or consumption of a good or service generate...
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Key Concepts
- Market Failure: Situations where the free market mechanism fails to allocate resources efficiently, leading to a sub-optimal outcome for society.
- Externality: A cost or benefit imposed on a third party who is not directly involved in the production or consumption of a good or service.
- Private Cost/Benefit: The direct costs or benefits incurred by the producer or consumer of a good or service.
- Social Cost/Benefit: The total cost or benefit to society, including both private costs/benefits and external costs/benefits.
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Exam Tips
- →Always clearly distinguish between private and social costs/benefits. Misidentifying these is a common error.
- →Be prepared to draw and accurately label diagrams for all four types of externalities, showing the welfare loss (deadweight loss). Ensure you label all curves (MPC, MSC, MPB, MSB) and equilibrium points (Q_market, Q_social).
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