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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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CREATIVE DESTRUCTION A fundamental process of capitalism, popularized by Joseph Schumpeter, in which the benefits of growth and prosperity induced by innovations also result in the costs of disrupting existing means of production. The creation of new activity involves the destruction of existing activity. This notion attributes business-cycle instability to innovations, including both the expansionary rise of prosperity, as well as a contractionary decline. Creative destruction is based on the idea that rather than tending toward equilibrium, the economy is largely in flux. A key question is one of cause and effect. Does innovation cause destruction or does destruction induce innovation?
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A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court!
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"Man is born to live, not to prepare for life. " -- Boris Pasternak, writer
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LRD
Longitudinal Research Database
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