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TRADE BARRIERS: Restrictions, invariably by government, that prevent free trade among countries. The more popular trade restrictions are tariffs, import quotas, and assorted nontariff barriers. An occasional embargo will be even thrown into this mix. The primary use of trade barriers is to restrict imports from entering in country. By restring imports, domestic producers of the restricted goods are protected from competition and are even subsidized through higher prices. Consumers, though, get the short end of this stick with higher prices and a limited choice of goods. In that producers tend to have more political clout than consumers, it's pretty obvious why trade barriers are a "natural" state of affairs.

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INFORMATION

The transfer of knowledge from one person to another. Information is a flow concept. It requires someone (or something) to do the sending and someone to do the receiving. Information is a valuable commodity that provides benefits, but also incurs an opportunity cost to produce, meaning information is never perfect or complete. The existence of asymmetric information (some have more information than others) gives rise to the problems of adverse selection, moral hazard, and the principal-agent problem.

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Today, you are likely to spend a great deal of time flipping through the yellow pages hoping to buy either a handcrafted bird house or a weathervane with a chicken on top. Be on the lookout for spoiled cheese hiding under your bed hatching conspiracies against humanity.
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A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court!
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