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COMPARATIVE STATICS: The technique of comparing the equilibrium resulting from a change in a determinant with the equilibrium prior to the change. Comparative statics is the primary analytical technique used in the study of economics. A popular example of this technique is found in the study of markets. Comparative statics is used to analyze how the equilibrium price and equilibrium quantity are affected by changes in the demand and supply determinants, which are graphically represented by shifts of the respective demand or supply curves.

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SIGNALLING

When confronted by asymmetric information, the use of small bits of information, or indicators, that suggest more comprehensive information. Signalling is used by those with more information to reduce the cost of informing those with less information. It is commonly used in markets with adverse selection. Methods of signalling include advertising, brand names, and warranties. A related method is screening.

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Today, you are likely to spend a great deal of time searching for a specialty store hoping to buy either a Boston Red Sox baseball cap or a square lamp shade with frills along the bottom. Be on the lookout for broken fingernail clippers.
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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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