Which of the following generate the type of externality previously described? Check all that apply. The local airport has doubled the number of runways, causing additional noise pollution for the surrounding residents. Felix has planted several trees in his backyard that increase the beauty of the neighborhood, especially during the fall foliage season. A microbiology lab has published its breakthrough in swine flu research. Your roommate, Susan, has bought a cat to which you are allergic.

Negative Externality

Explanation:

A negative externality happens when the creation or utilization of a decent aim a negative impact on an outsider. It is a secondary effect of an economic activity which besides, it's not reflected in the profit or direct costs of that activity. Some examples of negative externalities are loud music, pollution, vehicular congestion or building new roadsHence, the right answer is " the local airport has doubled the number of runways, causing additional noise pollution for the surrounding residents"