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KONDRATIEFF CYCLE: A cycle of economic activity lasting between 45 and 60 years that acquired the name of the first economist to study it, the Russian economist N. D. Kondratieff. The Kondratieff cycle is somewhat controversial and has been attributed to a number of different causes, including investment in transportation infrastructure. This is one of four separate cycles of macroeconomic activity that have been documented or hypothesized. The other three are Kitchin cycle, Juglar cycle, and Kuznets cycle.

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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 visiting every yard sale in a 30-mile radius hoping to buy either a large flower pot shaped like a Greek urn or a small palm tree that will fit on your coffee table. Be on the lookout for rusty deck screws.
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A scripophilist is one who collects rare stock and bond certificates, usually from extinct companies.
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