How is the marginal social benefit curve positioned on a graph when there are positive externalities?

Question

Quizplus · Accepted Answer

When there are positive externalities, the marginal social benefit (MSB) curve is positioned above the private demand curve because it accounts for the additional benefits to society that are not captured by the private demand. The curve typically has a negative slope, reflecting the principle that the additional benefit to society decreases as the quantity increases.

How Is the Marginal Social Benefit Curve Positioned on a Graph