If most people are inoculated against chicken pox and even though you are not inoculated your chances of getting the disease are reduced,this is an example of a negative externality.

Question

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This is an example of a positive externality because the widespread vaccination of others provides a benefit to those who are not vaccinated by reducing the overall prevalence of the disease, thereby lowering the chances of non-vaccinated individuals from contracting it.

If Most People Are Inoculated Against Chicken Pox and Even