There are four lighthouses on the island of Sand. If this is the efficient quantity of lighthouses
A) the marginal social benefit of the fourth lighthouse equals its marginal social cost.
B) total social benefit is zero.
C) marginal social benefit minus marginal social cost is a maximum.
D) Both answers A and C are correct.

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The Answer of There are four lighthouses on the island of Sand. If this is the efficient quantity of lighthouses
A) the marginal social benefit of the fourth lighthouse equals its marginal social cost.
B) total social benefit is zero.
C) marginal social benefit minus marginal social cost is a maximum.
D) Both answers A and C are correct.

There Are Four Lighthouses on the Island of Sand