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ARC ELASTICITY: The average elasticity for discrete changes in two variables, A and B. The distinguishing characteristic of arc elasticity is that percentage changes are calculated based on the average of the initial and ending values of each variable, rather than only initial values. Arc elasticity is generally calculated using the midpoint formula. Arc elasticity should be compared with point elasticity. For infinitesimally small changes in variables A and B, arc elasticity is the same as point elasticity.

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MODEL: An abstract representation of the real world that is usually based on scientific theories, principles, and hypotheses. The feature of a model that bears emphasizing is that it is an abstract representation of real world phenomenon. For economic models, this abstraction usually takes the form of words, graphs, or equations.

     See also | abstraction | abstraction methods | economic analysis | theory | scientific method | phenomenon | market | demand curve | supply curve | price | quantity |


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DEFLATION

A persistent decrease in the average price level in the economy. This is the direct opposite of inflation, a persistent increase in the average price level. Like inflation, deflation occurs when the AVERAGE price level decreases over time. While some prices might decrease, other prices could increase or remain unchanged, deflation occurs if the AVERAGE follows a downward trend. Another related phenomenon is disinflation, a decrease in the inflation rate.

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PINK FADFLY
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Today, you are likely to spend a great deal of time driving to a factory outlet trying to buy either a coffee cup commemorating last Friday (you know why) or a wall poster commemorating the first day of spring. Be on the lookout for mail order catalogs with hidden messages.
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The average length of a "business lunch" is about 36 minutes.
"It is not fair to ask of others what you are unwilling to do yourself. "

-- Eleanor Roosevelt, diplomat, activist

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