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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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EQUILIBRIUM

A state that exists when opposing forces are in balance, with each force exactly offsetting the other, such that there is no inherent tendency for change. Once achieved, an equilibrium persists unless or until it is disrupted by an outside force. The notion of equilibrium is an essential feature in most economic models, such as the market model.

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Today, you are likely to spend a great deal of time looking for the new strip mall out on the highway hoping to buy either a rechargeable battery for your computer or shoe laces for your snow boots. Be on the lookout for defective microphones.
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The first paper notes printed in the United States were in denominations of 1 cent, 5 cents, 25 cents, and 50 cents.
"Everyone's got it in him, if he'll only make up his mind and stick at it. None of us is born with a stop-valve on his powers or with a set limit to his capacities. There's no limit possible to the expansion of each one of us."

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