Use Figure: Externalities and Deadweight Loss I

Multiple Choice

Use Figure: Externalities and Deadweight Loss I. The figure shows the marginal private benefit, marginal social benefit, and marginal private cost for a good. The free-market equilibrium price of the good is _____, and the equilibrium quantity is _____ units.
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Figure: Externalities and Deadweight Loss I

A) $15; 30
B) $20; 40
C) $20; 30
D) $15; 40