Definition

Marginal Social Cost (MSC) (Definition and Formula)

The marginal social cost (MSC) represents the full cost to society of producing one additional unit of a good. It is calculated by adding the producer's direct cost (marginal private cost, or MPC) to the costs imposed on others through externalities (marginal external cost, or MEC). This relationship is captured by the formula: MSC=MPC+MECMSC = MPC + MEC.

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Updated 2026-05-02

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