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 in the diagram reflects private benefits and the other reflects social benefits. 
Refer to the figure above.The dollar value of the external ______ is _____ per vaccine.
Definitions:
Chain-Style
A business model that involves establishing multiple outlets under the same brand and management, typically in different locations.
Federal Franchise Rule
A regulation established by the Federal Trade Commission that requires franchisors to provide full disclosure of material facts to prospective franchisees.
Contract Law
The body of law that governs agreements, obligations, and remedies between parties.
State Law
Legislation enacted by individual states that governs within the state's boundaries, as opposed to federal law which governs at the national level.
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