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M10.L02 — The Coase Theorem and Private Solutions

Module: Module 10 — Externalities and Market Failure Lesson: L02 of 05 Duration: ~30 minutes Level: Introductory Provenance: Principles of Microeconomics (Curtis and Irvine) | MIT OCW 14.01 Principles of Microeconomics

Learning Objective

Explain the Coase theorem and its implications for resolving externalities through private bargaining.

The Coase Theorem

The Coase theorem states that if property rights are clearly defined and transaction costs are low, private bargaining between parties can achieve an efficient outcome regardless of how rights are initially assigned. For example, water rights trading in the Murray-Darling Basin allows farmers to negotiate allocations efficiently.

However, the theorem fails when transaction costs are high (e.g., negotiating with thousands of polluters) or property rights are unclear.

Worked Example

Resolving Noise Pollution Between Neighbours in Sydney

  1. Scenario: A musician practices loudly, disturbing their neighbor.
  2. Property Rights: If the musician has the right to play, the neighbor can pay them to stop.
  3. Outcome: The efficient solution (e.g., soundproofing) emerges if negotiation costs are low.

Common Misconception

"The Coase theorem guarantees efficient outcomes in all cases."

The theorem only applies when transaction costs are negligible and property rights are enforceable. In reality, many externalities (e.g., climate change) involve high transaction costs.

Key Takeaways

  • Private solutions work best with low transaction costs and clear property rights.
  • Social norms and charities can address externalities when markets fail.
  • Water trading in Australia demonstrates successful Coasian bargaining.
  • Government intervention is needed when private solutions are impractical.

Practice

  1. Why does the Coase theorem fail for global externalities like climate change?
  2. How does water rights trading in Australia illustrate the Coase theorem?
  3. What are some "private solutions" to externalities besides bargaining?

Further Resources

Provenance: Principles of Microeconomics (Curtis and Irvine) | MIT OCW 14.01 Principles of Microeconomics