In Costa Rica, only a few beaches remain that are nesting grounds for sea turtles. Some of those beaches have communities situated near them; traditionally, the local people collected the turtle eggs and sold them for their purported aphrodisiac powers. As a result, sea turtle populations became endangered. To protect the sea turtle populations, the Costa Rican government gave each family in these villages ownership of a portion of the beach to do with as they please, including the harvesting and selling of sea turtle eggs. Sea turtle populations have started to increase. What is the economic rationale for this result?