Refer to the graph shown, which shows the demand and supply for a new vaccine against the common cold. Once vaccinated, a person cannot catch a cold or give a cold to someone else. The socially efficient level of output is:
A. greater than or less than Q0 depending on the income elasticity of demand and the effectiveness of the vaccine.
B. less than Q0.
C. equal to Q0.
D. greater than Q0.
Answer: D
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