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Definition of Externality

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Definition: An externality is an effect of a purchase or use decision by one set of parties on others who did not have a choice and whose interests were not taken into account.

Classic example of a negative externality: pollution, generated by some productive enterprise, and affecting others who had no choice and were probably not taken nto account.

Example of a positive externality: Purchase a car of a certain model increases demand and thus availability for mechanics who know that kind of car, which improves the situation for others owning that model.

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