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CHANGE IN QUANTITY DEMANDED: The movement along a demand curve caused by a change in the price of the good. This should be contrasted directly with a change in demand. You might also want to review the terms change in quantity supplied and change in supply, as well. A change in quantity demanded means that we have identified a NEW quantity on the existing demand curve. In contrast, a change in demand means that we have changed, moved, or shifted, the entire demand curve, the whole range of prices and quantities has changed.

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ABSTRACTION

Simplifying the complexities of the real world by ignoring (hopefully) unimportant details while doing economic analysis. Abstraction is an essential feature of the scientific method. Hypothesis verification, model construction, and comparative static analysis are not possible without abstraction.

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