• 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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Start with the concept explanation, then practise to create mastery evidence.
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Learning objective
2.8.2—Externalities and welfare loss
New
• 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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Start with the concept explanation, then practise to create mastery evidence.
3
Learning objective
2.8.4—Common pool resources
New
• Common pool resources are rivalrous but non-excludable
• The tragedy of the commons can cause unsustainable production and negative externalities
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Mistakes
Start with the concept explanation, then practise to create mastery evidence.
4
Learning objective
2.8.5—Responses to externalities and common pool resource problems
New
• 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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Mistakes
Start with the concept explanation, then practise to create mastery evidence.
5
Learning objective
2.8.6—Evaluating policy responses
New
• 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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Mistakes
Start with the concept explanation, then practise to create mastery evidence.