Answer:
1. Fish in private stream (rival/Excludable). Fish in River (rival/non Excludable)
2. Fish in Private stream (private good). Fish in River (common resource)
3. Tragedy of commons
Step-by-step explanation:
1. The fish in the private stream are Rival in consumption and Excludable while the fish in the river are Rival in consumption and Non- Excludable
2. The fish in the private stream is a private good, the fish in the river is a common resource.
A private good must be purchased to be consumed. Consumption by one person prevents another person from consuming it hence it is rival and Excludable. A common resource like the river benefits all individuals because it is not owned by any one individual. A common resource stands the risk of depletion and over consumption.
3. Fishing in the river will lead to tragedy of the commons because anyone can fish in the river, and one person's fishing activity decreases the ability of someone else to fish with success.