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.Private incentives will lead to _____ people receiving the vaccine at a cost of _____.
Definitions:
Utility Function
A mathematical representation that describes how the total utility of a consumer depends on the consumption of various goods and services.
Budget Line
A visual depiction of every potential pair of two products a consumer is able to buy based on their earnings and the costs of these items.
Utility Function
A mathematical representation of how different quantities of goods or services translate into levels of happiness or satisfaction for an individual or society.
Utility Function
A mathematical representation that assigns a value to every possible choice to indicate the level of satisfaction or utility that choice provides to a consumer.
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