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VARIABLE COST: In general, cost that changes with changes in the quantity of output produced. More specifically, variable cost is combined with the adjectives "total" and "average" to indicate the overall level of variable cost or the per unit variable cost. Variable cost depends on the amount of produced. If there is no production, then there is no variable cost.

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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 browsing about a thrift store hoping to buy either a handcrafted bird house or a weathervane with a chicken on top. Be on the lookout for malfunctioning pocket calculators.
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Francis Bacon (1561-1626), a champion of the scientific method, died when he caught a severe cold while attempting to preserve a chicken by filling it with snow.
"Nothing great has ever been achieved except by those who dared believe that something inside them was superior to circumstances. "

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