Use Figure: Positive Externalities and Deadweight Loss

Multiple Choice

Use Figure: Positive Externalities and Deadweight Loss. The figure shows the marginal private benefit, marginal social benefit, and marginal private cost for a good. The socially optimal price of the good is _____, and the socially optimal quantity is_____ units.
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Figure: Positive Externalities and Deadweight Loss

A) $8; 50
B) $13; 50
C) $8; 70
D) $13; 70