Spring is here, and Megan and her uncle would like to go fishing for the weekend in Vermont. Megan could either go to the river in town where anyone can fish without a permit, or she could drive up to a pond located on her family's property in the countryside to fish. Assume that, no matter where people fish, all of the fish that are caught would be kept (that is, there is no ''catch and release'' policy).

The fish in the river are considered and whereas the fish in the private pond are and . In other words, the fish in the river are an example of , and the fish in the private pond are an example of .

Fishing in the river will likely lead to because of which of the following reasons?

Nobody will enjoy fishing because of the lack of private contributions to the maintenance of the river.

Anyone can fish in the river, and one's person's fishing activity decreases the ability of someone else to fish with success.

All fishermen will choose to fish in the river because of the limited access to the pond.

All fishermen will choose to fish in the pond believing that there are more fish there.