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 socially optimal number of vaccines is _______.
Definitions:
Proportionately Adjusted Income Statement
An income statement that has been adjusted to reflect changes in economic ownership or scale of operations.
Contractual Agreement
A legally binding agreement between two or more parties, typically involving the exchange of goods, services, money, or promises.
Financial Statements
Formal records of the financial activities and condition of a business, entity, or individual, including balance sheet, income statement, and cash flow statement.
Acquisition Differential
The gap between what a company is bought for and the net market value of its recognizable assets and liabilities.
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