Answer:
Common-resource goods are rival and non excludable. Together with club goods, they represent a kind of middle ground between private goods and public goods. A typical example would be any marketable ocean-dwelling fish, since exclusion is not practical and fish stocks are depletable.
Explanation:
Common-resource goods are 'rival' in consumption and also 'non-excludable'. Ocean-dwelling fish is an example of such resource because we cannot exclude any fish from consuming the clean water.
A good is said to be rival in consumption if 'same unit' of that good cannot be used by more than 'one' person at a given time. Non-excludable means that the supplier cannot avoid or block the utilization of that good even for people who are not paying for that good.
