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Comparison of Social and Private Costs in Negative Consumption Externalities

In the presence of a negative consumption externality, the marginal social cost (MSC) of consuming a good is greater than the marginal private cost (MPC) borne by the individual consumer. This is because the MSC includes both the private cost and the additional marginal external cost (MEC) imposed upon third parties. This divergence leads to over-consumption of the good relative to the socially optimal level.

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Updated 2025-08-21

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