Question

multiple choice question a(n) ______ externality is the unpaid benefit of an activity that is enjoyed by a third party. positive social private negative

Explanation:

An externality is a cost or benefit affecting a third party not involved in the activity. A positive externality specifically refers to an unpaid benefit gained by a third party from an activity, which matches the definition provided. Negative externalities involve unpaid costs, private benefits/costs affect the direct participants, and social externality is not the specific term for this defined benefit.

Answer:

A. positive