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Which of the following is not an example of negative externality ?

  • A.Air pollution
  • B.Vaccination
  • C.Contamination of water
  • D.Crime

Answer: B

Vaccination is not a negative externality.

A vaccinated person is less likely to catch and spread a disease, which protects others who were not part of the decision. That third-party benefit makes vaccination a classic example of a positive externality.

Air pollution, contamination of water and crime all impose costs on people who did not choose them, which makes them negative externalities.

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