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NUMBER OF BUYERS: One of the five demand determinants assumed constant when a demand curve is constructed, and that shift the demand curve when they change. The other four are income, preferences, other prices, and buyers' expectations. This determinant is based on the simple observation that if more people are willing and able to buy a good, then demand is greater.

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ARC ELASTICITY

The average elasticity for discrete changes in two variables. The distinguishing characteristic of arc elasticity is that percentage changes are calculated based on the average of initial and ending values of each variable, rather than initial values. Arc elasticity is generally calculated using the midpoint elasticity formula. The contrast to arc elasticity is point elasticity. For infinitesimally small changes in two variables, arc elasticity is the same as point elasticity.

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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 large, stuffed kitty cat or a cross-cut paper shredder. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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Approximately three-fourths of the U.S. paper currency in circular contains traces of cocaine.
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