ECON 221 Chapter Notes - Chapter 10: Coase Theorem, Influenza Vaccine, Pigovian Tax

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A private cost is a cost paid by the consumer or the producer (typically the market price) An external cost is a cost paid by people other than the consumer or the producer trading in the market (typically by bystanders to the transaction) The social cost is the cost to everyone: the private cost + the external cost) Lo 1: external costs, external benefits, and efficiency social surplus social surplus, which is cs +ps + everyone else"s surplus. Externalities are external costs or external benefits that fall on bystanders. When externalities are significant, markets work less well and gvt action can increase. When we evaluate how well a market with externalities is working, we want to look at. A market with externalities hence does not maximize social surplus. The price and quantity that maximize social surplus is the efficient equilibrium. If there are no externalities, the market equilibrium is also the efficient equilibrium.

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