Which of the Following Describes an External Benefit Resulting from an Individual's

Multiple Choice

Which of the following describes an external benefit resulting from an individual's purchase of a winter flu shot?

A) ​A flu shot is less expensive than the cost of treatment when you get the flu.
B) ​The income of doctors increases when you get a flu shot.
C) ​A flu shot reduces the likelihood that others will catch the flu from you.
D) ​A flu shot reduces the likelihood that you will miss work as a result of sickness, and, therefore, you will earn more income.