The legal status of a corporation derives from three arcane but vital principles: (1) limited liability, (2) transferability of shares, and (3) virtual personhood.
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But what is a virtual person? No, we're not talking about Commander Data here. Virtual personhood simply means that a corporation, as far as the law is concerned, is treated as though it were a human being. It has a name, can own property, enter into contracts, file lawsuits and be sued, be taxed by the government, open bank accounts and establish credit, and so on. In all these situations, the corporation acts as its own person, entirely distinct from the persons who own it (who, by the way, might be other virtual persons themselves). Corporations even have many of the same rights as persons, such as the right to free speech. Case law in the United States, however, recognizes that the speech of actual persons is generally more important than virtual ones. Curiously, the U.S. Supreme Court established the personhood of corporations through a famous (or infamous) 1886 decision based on the 14th amendment--you know, the one intended to protect the rights of former slaves. The court held that "equal protection of the laws" applies to artificial persons as well as natural ones.
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Cheers,
Scott.