ECON 201 Lecture Notes - Lecture 6: Economic Equilibrium, Marginal Cost, Marginal Utility

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7 Dec 2016
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An externality is an interaction between economic agents that occurs outside of markets: a cost or benefit incurred by someone not directly involved in consumption or production of goods sold in a market. The welfare theorems that say market equilibria are efficient assume there are no externalities: externalities can produce market failures, marginal cost is not equal to the marginal benefit. Negative externalities hurt people: pollution and environmental damage, congestion and over crowding, crime and violence. Positive externalities help people: knowledge transfers, environmental improvements, synergies, where 1+1 is greater than 2. One of the responsibilities of a government is to regulate externalities: some would argue that the only proper role of government is to regulate externalities. We have said before that markets cannot function without a government: the government needs to eliminate involuntary transfers of property outside of markets, i. e. theft. The supply curve at q measures the marginal cost of producing the qth good.

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