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Applying and Testing Concepts of Quasi-Linearity in Externality Models

In externality models, assuming quasi-linear preferences makes the marginal external cost independent of the parties' wealth, so the marginal social cost curve does not shift when income is redistributed and a single, unique Pareto-efficient level of output emerges. Relaxing the assumption lets the efficient output depend on the distribution of income, so multiple efficient levels can arise. Applying and testing these ideas means judging how the assumption shapes conclusions about Pareto efficiency, the stability of cost curves, and the fairness of policy recommendations.

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Updated 2026-07-20

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