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ENDPOINT FORMULA: A simple technique for calculating the coefficient of elasticity that estimates the elasticity for discrete changes in two variables, A and B. The distinguishing characteristic of this formula is that percentage changes are calculated based on the initial values of each variable. This is much simpler than the midpoint formula, which is based on the percentage change from an average of the initial and ending values. The primary problem with the endpoint formula is that different elasticity values are obtained for price increases than for price decreases of the same segment of the demand curve.
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AVERAGE-MARGINAL RELATION A mathematical connection between a marginal value and the corresponding average value stating that the change in the average value depends on a comparison between the average and the marginal. This mathematical relation between average and marginal surfaces throughout the study of economics, especially production (average product and marginal product), cost (average total cost and marginal cost), and revenue (average revenue and marginal revenue). A similar relation is that between a total value and the corresponding marginal value.
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BLACK DISMALAPOD
[What's This?]
Today, you are likely to spend a great deal of time searching for a specialty store wanting to buy either storage boxes for your winter clothes or several magazines on time travel. Be on the lookout for the last item on a shelf.
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This isn't me! What am I?
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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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"I don't know the key to success, but the key to failure is trying to please everybody. " -- Bill Cosby
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JEH
Journal of Economic History
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