Positive externalities:

A) are similar to negative externalities in their ease of measuring marginal benefits.
B) are likely to be solved with the use of a Pigouvian tax.
C) are difficult to measure since marginal social benefits are hard to observe.
D) result from greater than optimal production of a good.

Marginal Social Benefits

The extra advantage obtained by society from the consumption of an additional unit of any product or service.

Positive Externalities

Benefits that are enjoyed by third-parties as a result of an economic transaction or activity, without them directly participating in the transaction.

Pigouvian Tax

A tax imposed on activities that generate negative externalities, aimed at correcting an inefficient market outcome.