The Salmon River is famous for its abundance of salmon. Because the river is part of the community of Salmon Falls, anyone is able to fish in it. At the most recent town hall meeting, the mayor of Salmon Falls expressed concern that the river was being overused. She said that fishermen had no incentive to use the river sustainably since their goal was to sell as much salmon as possible. This is an example of
a. the free-rider problem.
b. moral hazard.
c. common property resource.
d. asymmetric information.
e. adverse selection.