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LAW OF COMPARATIVE ADVANTAGE: A basic principle that states every nation has a production activity that incurs a lower opportunity cost than that of another nation, which means that trade between the two nations can be beneficial to both if each specializes in the production of a good with lower relative opportunity cost. While this law is fundamental to the study of international trade, it also applies to other activities, especially the specialization and the division of labor.

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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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Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club looking to buy either a set of luggage with wheels or a birthday gift for your aunt. Be on the lookout for neighborhood pets, especially belligerent parrots.
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The average bank teller loses about $250 every year.
"In the long run men hit only what they aim at. "

-- Henry David Thoreau, philosopher

GARP
Generalized Axioms of Revealed Preference
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