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REAL PURCHASING POWER: The ability to acquire wants-and-needs satisfying goods and services with income or money. The real purchasing power of income or money depends on the prices of the goods and services. If the price level, for example, doubles, then a given amount of money can purchase half as many goods and services.

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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
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Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club trying to buy either a case of blank recordable DVDs or a pair of red goulashes with shiny buckles. Be on the lookout for defective microphones.
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On a typical day, the United States Mint produces over $1 million worth of dimes.
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Bell Journal of Economics
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