What is a positive externality?

Question

A. Positive externalities occur when there is both a social benefit and a private from a good one service.
B. Positive externalities occur whenever there is a private benefit to a good or service.
C. Positive externalities occur when a service is available without cost.
D. Positive externalities occur whenever there is a social benefit to a good or service.

Answer 1

A. Positive externalities occur when there is both a social benefit and a private benefit from a good or service.