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Externalities in Theory
Master the economics of market failures, from climate change and SUVs to Coase's theorem and carbon taxes.
Lecture guide · Written by AI from the lecture. For the lecture’s own words, open the Transcript tab.
Examines the theoretical foundations of externalities, distinguishing between negative and positive production and consumption externalities using economic graphs and models. It explores private negotiation solutions via the Coase Theorem alongside its limitations, and evaluates public sector interventions comparing corrective taxation, subsidies, quantity regulation, and cap-and-trade systems.
Key Takeaways
- Externalities occur when an action by one party impacts another without the first party bearing the full consequence.
- Negative externalities lead to overproduction or overconsumption because private actors ignore external costs, creating a deadweight loss.
- The Coase Theorem posits that well-defined property rights and zero transaction costs enable private parties to bargain to an efficient outcome regardless of who holds the rights.
- Real-world bargaining breaks down due to the assignment problem, holdout problems, free-riding, and transaction costs.
Concepts Explained22
Externality—An externality arises whenever the actions of one party impact another party and the first party does not bear the consequence of doing so.
Negative Production Externality—A negative production externality occurs when the production process of a good imposes unintended costs or damage on a third party who does not bear those consequences.
Social Marginal Cost—The total cost to society of producing an additional unit of a good, which includes both the private marginal cost to the producer and the external damage imposed on others.
Deadweight Loss—The reduction in total surplus resulting from market inefficiency, such as when production exceeds the socially optimal level due to unpriced externalities.
Examples, Proofs & Derivations