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 external benefit of each dose is:
Definitions:
Pyridine
A basic heterocyclic organic compound with the chemical formula C5H5N, used as a precursor to agrochemicals and pharmaceuticals, and as a solvent.
Major Organic Product
The most abundant product formed in a chemical reaction, especially in organic synthesis.
Major Organic Product
The primary product formed in the greatest quantity during a chemical reaction involving organic compounds.
Alcohol Dehydrogenase
An enzyme that facilitates the oxidation and reduction of alcohols and aldehydes within the body.
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