For a Private Good, the Economy's Marginal Social Benefit Curve

Multiple Choice

For a private good, the economy's marginal social benefit curve is the ________ sum of the individual marginal benefit curves and for a public good, the economy's marginal social benefit curve is the ________ sum of the individual marginal benefit curves.

A) vertical; vertical
B) vertical; horizontal
C) horizontal; vertical
D) horizontal; horizontal
E) horizontal and vertical; vertical and horizontal