Definition

Marginal Social Cost (MSC)

The marginal social cost (MSC) is the total cost incurred by society to produce one additional unit of a good. It is calculated by adding the producer's marginal private cost (MPC) to the marginal external cost (MEC) borne by others, as shown in the formula: MSC=MPC+MECMSC = MPC + MEC. Consequently, when a negative externality exists (MEC > 0), the MSC is higher than the MPC.

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Updated 2025-08-29

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