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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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LEADING ECONOMIC INDICATORS

Ten economic statistics that tend to move up or down a few months BEFORE business-cycle expansions and contractions. Most importantly, these measures indicate peak and trough turning points about three to twelve months before they occur. Leading economic indicators are one of three groups of economic measures used to track business-cycle activity. The other two are coincident economic indicators and lagging economic indicators.

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Today, you are likely to spend a great deal of time at a dollar discount store seeking to buy either storage boxes for your summer clothes or 500 feet of coaxial cable. Be on the lookout for telephone calls from long-lost relatives.
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The first "Black Friday" on record, a friday marked by a major financial catastrophe, occurred on September 24, 1869 -- A FRIDAY -- when an attempted cornering of the gold market induced a financial crises and economy-wide depression.
"A leader, once convinced that a particular course of action is the right one, must . . . be undaunted when the going gets tough."

-- President Ronald Reagan

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