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Law
1. Law in common parlance means a rule which (unlike a rule of ethics) is capable of enforcement through institutions. The study of law crosses the boundaries between the social sciences and humanities, depending on one's view of research into its objectives and effects. Law is not always enforceable, especially in the international relations context. It has been defined as a «system of rules», as an «interpretive concept» to achieve justice, as an «authority» to mediate people's interests, and even as "the command of a sovereign, backed by the threat of a sanction".
2. However one likes to think of law, it is a completely central social institution. Legal policy incorporates the practical manifestation of thinking from almost every social sciences and humanity. Laws are politics, because politicians create them. Law is philosophy, because moral and ethical persuasions shape their ideas.
3. Law tells many of history's stories, because statutes, case law and codifications build up over time. And law is economics, because any rule about contract, tort, property law, labour law, company law and many more can have long lasting effects on the distribution of wealth.
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