Suppose That the Marginal Private Benefit of a New Vaccine $M P B = 10 - Q$

Multiple Choice

Suppose that the marginal private benefit of a new vaccine could be measured as $M P B = 10 - Q$ . Suppose that the marginal social benefit could be measured as $M S B = 12 - Q$ . Suppose that the private marginal cost curve could be measured as $M P C = Q$ . If there is no subsidy in this market,

A) society will over-consume this product by 2 units.
B) society will over-consume this product by 1 unit.
C) society will under-consume this product by 2 units.
D) society will under-consume this product by 1 unit.