Course review

2.8 Market failure - externalities and common pool or common access resources

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Learning objective

2.8.1—Socially optimum output

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• Social optimum occurs where marginal social benefit equals marginal social cost • Allocative efficiency maximizes social or community surplus • Diagram: allocative efficiency

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Learning objective

2.8.2—Externalities and welfare loss

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• Positive externalities of production or consumption create under-allocation without intervention • Negative externalities of production or consumption create over-allocation without intervention • Merit goods and demerit goods are linked to positive and negative externality cases • Diagram: market failure from negative production, negative consumption, positive production, and positive consumption externalities

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Learning objective

2.8.3 (HL)—Welfare loss calculation

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• Calculate welfare loss from an externality diagram

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Learning objective

2.8.4—Common pool resources

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• Common pool resources are rivalrous but non-excludable • The tragedy of the commons can cause unsustainable production and negative externalities

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Learning objective

2.8.5—Responses to externalities and common pool resource problems

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• Responses include Pigouvian taxes, carbon taxes, regulation, education, tradable permits, international agreements, collective self-governance, subsidies, and government provision • Diagram: government responses to externalities using Pigouvian taxes, carbon taxes, subsidies, legislation, regulation, and education • Diagram: carbon tax effects on a particular polluting industry

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2.8.6—Evaluating policy responses

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• Evaluation considers measurement challenges, policy effectiveness, and stakeholder consequences • International cooperation matters because sustainability issues are global • Monitoring and enforcement are major challenges in international cooperation

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