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TRADE BARRIER: A restriction, invariably by government, that prevents 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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SCREENING

When confronted by asymmetric information, the use of small bits of information, or indicators, that suggest more comprehensive information. Screening occurs when those with limited information try to identify indicators suggesting more complete information. It is used in markets with adverse selection and moral hazard, especially in labor markets and in the provision of insurance. Common methods of screening include aptitude tests, affiliations, past behavior, and personal characteristics. A related method is signalling.

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A communal society, a prime component of Karl Marx's communist philosophy, was advocated by the Greek philosophy Plato.
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