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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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PERFECT COMPETITION, REALISM

Perfect competition is an idealized market structure that does NOT exist in the real world. While some real world industries might come relatively close to one or two of the four key characteristics of perfect competition, none matches all four sufficiently that they can be declared PERFECTLY competitively. Some industries come close on the large number of small firms and the identical product characteristics. A few industries have relatively good, although not perfect, information about prices and technology. However, almost all industries fall far short of the perfect mobility characteristics.

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Today, you are likely to spend a great deal of time at a garage sale seeking to buy either one of those "hang in there" kitty cat posters or a velvet painting of Elvis Presley. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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This isn't me! What am I?

The wealthy industrialist, Andrew Carnegie, was once removed from a London tram because he lacked the money needed for the fare.
"Defeat is simply a signal to press onward."

-- Helen Keller, lecturer, author

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