The type of externality where market equilibrium quantity produced will be more than socially optimal quantity in absence of governemtn intervention is Negative externality.
Let understand that whenever a production of good or service negatively affect the unrelated third party who is not directly involved in a market transaction, it is said that negative externality exists in the scenario.
A very good example of commonly cited Negative Externalities are air pollution and noise pollution which was caused during production an affects unrelated third party.
If there is presence of government intervention in the production, then, the production of goods or service will be halted.
Therefore, in conclusion, this type of externality is called the Negative Externality.
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