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How do things come to be owned? This is a fundamental puzzle for anyone who thinks about property. One buys things from other owners, to be sure, but how did the other owners get those things? Any chain of ownership or title must have a first link. Someone had to do something to anchor that link. The law tells us what steps we must follow to obtain ownership of things, but we need a theory that tells us why these steps should do the job.
John Locke's view, once described as "the standard bourgeois theory," is probably the one most familiar to American students. Locke argued that an original owner is one who mixes his or her labor with a thing and, by commingling that labor with the thing, establishes ownership of it. This labor theory is appealing because it appears to rest on "desert," but it has some problems. First, without a prior theory of ownership, it is not self-evident that one owns even the labor that is mixed with something else. Second, even if one does own the labor that one performs, the labor theory provides no guidance in determining the scope of the right that one establishes by mixing one's labor with something else. Robert Nozick illustrates this problem with a clever hypothetical. Suppose I pour a can of tomato juice into the ocean: do I now own the seas?
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