Flu vaccinations help those who are vaccinated. They also

stop spreading the epidemic, benefiting others in the society. This is an

example of

($($a)$)$ a private good.

($($b)$)$ a negative externality.

($($c)$)$ a mechanism that is not incentive compatible.

($($d)$)$ a positive externality.

($($e)$)$ a congestible good.

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