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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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RESOURCE PRICES, SUPPLY DETERMINANT

The prices of the resource inputs that affect production cost and the ability to sell a particular good, which are assumed constant when a supply curve is constructed. An increase in resources prices causes a decrease in supply and a decrease in resource prices causes an increase in supply. Resources prices are one of five supply determinants that shift the supply curve when they change. The other four are production technology, other prices, sellers' expectations, and number of sellers.

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BLACK DISMALAPOD
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Today, you are likely to spend a great deal of time searching for rummage sales looking to buy either a case for your designer sunglasses or arch supports for your shoes. Be on the lookout for slow moving vehicles with darkened windows.
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A communal society, a prime component of Karl Marx's communist philosophy, was advocated by the Greek philosophy Plato.
"How wonderful it is that nobody need wait a single moment before starting to improve the world."

-- Anne Frank

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