Property is not just a legal concept, of course, and different disciplines express different philosophies about the purpose of property and the nature of property rights. To the jurist, property rights should be protected because it is just to do so. To an economist, the legal protection of property rights functions to create incentives to use resources efficiently. For a truly efficient system of property rights, some economists would require universality (everything is owned), exclusivity (the owners of each thing may exclude all others from using it), and transferability (owners may exchange their property). Together, these aspects of property would lead, under an appropriate economic model, to efficient production and distribution of goods. But the law of property does not entirely conform to the economic conception of the ownership of productive property by private parties; there remain many kinds of property that are not privately owned and some parts of the earth that are considered part of “the commons.” For example, large areas of the earth’s oceans are not “owned” by any one person or nation-state, and certain land areas (e.g., Yellowstone National Park) are not in private hands.
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