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CONCAVE: A curve that is 'bowed-in' toward the origin, like entering a cave. Technically speaking, the slope of a concave curve decreases from left to right as the X-axis variable increases.

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VALUE IN EXCHANGE

The ability to trade an item or asset, especially money, for other goods and services that can then be used to satisfy wants and needs. Value in exchange means that value (that is, satisfaction) is obtained indirectly through the acquisition of something else. For an item to have value in exchange it need NOT have value in use, value obtained directly from the consumption of a good or service.

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Today, you are likely to spend a great deal of time strolling through a department store looking to buy either a battery-powered, rechargeable vacuum cleaner or a remote controlled World War I bi-plane. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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Three-forths of the gold mined each year is used to manufacture jewelry.
"The purpose of learning is growth, and our minds, unlike our bodies, can continue growing as long as we live."

-- Mortimer Adler

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Time Series Processor (software)
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