The willingness of citizens to pay for a vaccinations does not include the benefit society receives from having vaccinated citizens who cannot transmit an illness to others.This extra benefit society gets from vaccinating its citizens is known as

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An externality is a benefit or cost that affects someone who is not directly involved in the production of a good or service. In this case, the benefit that society receives from having vaccinated citizens who cannot transmit an illness to others is an external benefit, as it is not factored into individual citizens' willingness to pay for their own vaccinations.

The Willingness of Citizens to Pay for a Vaccinations Does