If once vaccinated, a person cannot catch a cold or give a cold to someone else, the marginal social benefit resulting from consumption of the vaccine:
A. equals the marginal social cost of producing the vaccine in a competitive equilibrium.
B. equals the marginal benefit received by consumers of the vaccine in a competitive equilibrium.
C. exceeds the marginal benefit received by consumers of the vaccine.
D. is less than the marginal benefit received by consumers of the vaccine.
Answer: C
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