Suppose that a vaccine is developed for a highly contagious strain of flu. The likelihood that anyone will get this flu decreases as more people receive the vaccine. One of the demand curves below represents the private demand for the vaccine and the other represents the social demand for the vaccine. 
The private market equilibrium quantity is ________ doses per day.
Definitions:
Specialization Of Labor
A process where individuals or groups focus on performing specific tasks or roles to increase efficiency and output.
Relatives
Individuals who are connected by blood or marriage and may have legal obligations or strong emotional ties to each other.
Trade
The action of buying, selling, or exchanging goods and services between people or countries.
Production
The process of combining various material inputs and immaterial inputs (plans, know-how) to make something for consumption (output).
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