Suppose a Bridge for Automobiles Was Constructed Across a River

Essay

Suppose a bridge for automobiles was constructed across a river and all the costs associated with its construction have been paid. The amount of traffic is such that there are no foreseeable problems of overcrowding in the use of the bridge. Assume, also, that the extra cost associated with traffic crossing the bridge is for all practical purposes equal to zero. What toll should be charged to achieve the most efficient use of the bridge?