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Principles of Microeconomics/Factor Markets
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Optimal Equilibrium With Positive Externalities

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In the provided graph, D-1 represents the private demand curve and D-T represents the social demand curve that includes a positive externality. Which point indicates the socially optimal equilibrium?

A

The optimal equilibrium occurs on the supply curve at points A and B.

B

The optimal equilibrium occurs on the supply curve at points A and D.

C

The optimal equilibrium occurs on the supply curve at points B and C.

D

The optimal equilibrium occurs at price point B.

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