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 deadweight loss because of the externality is equal to:
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Figure: Positive Externalities and Deadweight Loss

A) $20.
B) $30.
C) $50.
D) $70.