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) less than Q₀. B) greater than or less than Q₀ depending on the income elasticity of demand and the effectiveness of the vaccine. C) greater than Q₀. D) equal to Q₀.

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The Answer of 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) less than Q₀. B) greater than or less than Q₀ depending on the income elasticity of demand and the effectiveness of the vaccine. C) greater than Q₀. D) equal to Q₀.

Refer to the Graph Shown, Which Shows the Demand and Supply