The market demand curve of a good that is rival in consumption and excludable is the horizontal sum of the individual demand curves. However, the marginal social surplus curve of a public good is the vertical sum of the individual marginal benefit curves. As What aspect of a public good causes the demand curves to be summed vertically instead of horizontally? Whether we sum vertically or horizontally depends only on whether the good is excludable. Whether we sum vertically or horizontally depends only on whether the good is rival in consumption.

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Chapter10: Externalities
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The market demand curve of a good that is rival in consumption and excludable is
the horizontal sum of the individual demand curves. However, the marginal social
surplus curve of a public good is the vertical sum of the individual marginal
benefit curves.
What aspect of a public good causes the demand curves to be summed vertically
instead of horizontally?
Whether we sum vertically or horizontally depends only on whether the good
is excludable.
Whether we sum vertically or horizontally depends only on whether the good is
rival in consumption.
A vertical sum of individual demand curves is the same thing as a horizontal sum
of individual demand curves.
Whether we sum vertically or horizontally depends on whether the government,
as opposed to the free market, usually provides the good.
Transcribed Image Text:The market demand curve of a good that is rival in consumption and excludable is the horizontal sum of the individual demand curves. However, the marginal social surplus curve of a public good is the vertical sum of the individual marginal benefit curves. What aspect of a public good causes the demand curves to be summed vertically instead of horizontally? Whether we sum vertically or horizontally depends only on whether the good is excludable. Whether we sum vertically or horizontally depends only on whether the good is rival in consumption. A vertical sum of individual demand curves is the same thing as a horizontal sum of individual demand curves. Whether we sum vertically or horizontally depends on whether the government, as opposed to the free market, usually provides the good.
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