PADP 6950 Lecture Notes - Lecture 16: Economic Equilibrium, Demand Curve, Social Cost

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Rival: if one person bene ts from the good, it prevents anyone else from bene ting from it. Marginal social bene t (demand) = marginal social cost (supply) at market equilibrium price & quantity. Non rival: if one person consumes the good it does not prevent anyone else from consuming it at the same time. Rms tend to only want to sell good to individuals who are willing/able to pay for them. Socially optimal quantity: optimal quantity of a public good is where the marginal social cost curve intersects the marginal social bene t curve. In private market, exchanges occur up until the good"s marginal cost equals individuals" private marginal bene t. But, once q2 has been provided by person. 2, person 1 gets to enjoy it without paying (free-rider problem) Therefore, with private provision, equilibrium quantity is where the highest individual mb curve intersects the mc curve.

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