ECON 040 Lecture Notes - Lecture 17: Public Good, Aggregate Demand, Marginal Cost

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9:1 (last lecture slide from last wk ) Aggregating individual demands: marginal social benefit and efficiency. Unlike private goods, for a public good, we need to sum up the demand curves for every individual vertically to find our aggregate demand curve (see above). Looking at the above example, the marginal social benefit (the aggregate demand curve for both individuals), is greater than the individual demand curves. It tells us that they are collectively unwilling to spend more than /hour or 10hours/week on cleaning services: the marginal social benefit is the vertical sum of the individual. Because this good is public (non-rival and non-excludable), if one person hires the cleaner, then the other person doesn"t have to, because both flatmates receive the benefit achieved from 1 person paying for the cleaner. In a market, private goods are provided efficiently, public goods are not.

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