Define non-excludability and non-rivalry with examples from fisheries and clean air.

Define non-excludability and non-rivalry with examples from fisheries and clean air.

• A. Non-excludability means you can easily prevent use; non-rivalry means one person's use reduces others.
• B. Non-excludability means you cannot easily prevent use; non-rivalry means one person's use does not reduce another's; Clean air is non-excludable and non-rival; many fisheries are rivalrous and may be non-excludable without regulation.
• C. Non-excludability means you cannot easily prevent use; non-rivalry means one person's use does not reduce another's; Clean air is excludable.
• D. Non-excludability means you can prevent use; non-rivalry means one person's use reduces others.

Answer: (C)