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M11.L03 — Common Resources and the Tragedy of the Commons

Module: Module 11 — Public Goods and Common Resources Lesson: L03 of 05 Duration: ~30 minutes Level: Introductory Provenance: OpenStax Principles of Microeconomics 3e | Microeconomics 1e (Medeiros)

Learning Objective

Analyze how unrestricted access leads to overuse of common resources.

Tragedy of the Commons

Garrett Hardin's (1968) concept explains why shared resources get depleted: - Each user gains individually from increased use - Costs of overuse are shared by all - Rational individuals overconsume

Australian examples: - Murray-Darling Basin: Water allocations exceed sustainable levels - Great Barrier Reef: Overfishing threatens ecosystem - Urban roads: Congestion from unlimited access

Worked Example

Fisheries Management 1. Unregulated: Each fisher maximizes catch → stock depletion 2. Solutions: - Quotas (individual transferable quotas in Australian fisheries) - Licenses (limited commercial fishing permits) - Community management (Indigenous ranger programs)

Common Misconception

"Privatization always solves commons problems"

While privatization can help (e.g., grazing rights), some resources can't be easily divided (e.g., air quality). Elinor Ostrom showed community governance often works better.

Key Takeaways

  • Unregulated common resources face overuse
  • Individual incentives conflict with group welfare
  • Solutions include privatization, regulation, and community management
  • Australian examples show real-world applications

Practice

  1. Why does adding lanes often fail to reduce traffic congestion?
  2. How do Sydney parking meters address commons problems?
  3. Compare water markets in the Murray-Darling to traditional quotas

Further Resources

Provenance: OpenStax Principles of Microeconomics 3e | Microeconomics 1e (Medeiros)