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MENTAL MODEL · M4693

Common Pool Resources

Common Pool Resources
BusinessHigh supportMicroeconomics
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Updated 2026-08-02

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INTRODUCTION

English translation pending.

CORE DEFINITION

Common-pool resources are non-excludable but rivalrous: fisheries, groundwater basins, forests, and clean air are open to many users, yet each unit taken leaves less for everyone else. This combination creates the tragedy of the commons, in which individually rational use depletes the resource. Managing them well requires governance mechanisms such as quota systems, community self-governance, or state regulation.

SCAFFOLDING EFFECT

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- Diagnose depletion risk: check whether a shared resource is rivalrous and hard to exclude. - Choose governance: compare quotas, property rights, and community self-rule before imposing control. - Design monitoring: assign who watches use and what sanction follows overuse.

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Because no user can be excluded, each person captures the full benefit of their own extraction while bearing only a fraction of the cost of depletion. Rational actors therefore overuse the resource until returns collapse. Governance works by reconnecting individual decisions to collective consequences, through quotas, monitoring, and sanctions that make overuse personally costly for the user.

MINIMUM ACTION

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