to classify a pizza as a private good and a city park as a public good, what about an item that is nonexcludable

and rivalrous, such as the queen conch?

In the Caribbean, the queen conch is a large marine mollusk that lives in shallow waters of sea grass. These

waters are so shallow, and so clear, that a single diver may harvest many conch in a single day. Not only is

conch meat a local delicacy and an important part of the local diet, but artists use the large ornate shells and

craftsmen transform them. Because almost anyone with a small boat, snorkel, and mask, can participate in the

conch harvest, it is essentially nonexcludable. At the same time, fishing for conch is rivalrous. Once a diver
catches one conch another diver cannot catch it.

We call goods that are nonexcludable and rivalrous common resources. Because the waters of the Caribbean

are open to all conch fishermen, and because any conch that youcatch is a conch that Icannot catch,
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