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VARIABLE: A quantity, usually represented as a symbol, that can take on one of a set of values. Variables play a key role in the scientific method and economic analysis. A major task undertaken by the study of economics is to identify the specific value of variables such as price, quantity, unemployment, production, wages, income, among a host of others. This often accomplished using assorted models, such as the market model.

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CROSS ELASTICITY OF DEMAND

The relative response of a change in the demand for one good to a change in the price of another good. More specifically the cross elasticity of demand is percentage change in the demand for one good due to a percentage change in the price of another good. This notion of elasticity captures the other prices demand determinant. Three other notable elasticities are the price elasticity of demand, the price elasticity of supply, and the income elasticity of demand.

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Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club seeking to buy either a weathervane with a horse on top or a case of blank recordable DVDs. Be on the lookout for cardboard boxes.
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The 1909 Lincoln penny was the first U.S. coin with the likeness of a U.S. President.
"He who hesitates is poor. "

-- Mel Brooks, writer, director, comedian

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