Answer:
A negative externality is a cost that a third party incurs from someone else's economic activity. When the third party experiences a beneficial effect, it is called a positive externality.
Requires the government to impose a tax.
EX:
Your roommate, Dmitri, has bought a bird that keeps you up at night with its chirping.
The local airport has doubled the number of runways, causing additional noise pollution for the surrounding residents.
Step-by-step explanation: