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IMPERFECT COMPETITION: Any markets or industries that do not match the criteria for perfect competition. The key characteristics of perfect competition are: (1) a large number of small firms, (2) identical products sold by all firms, (3) freedom of entry into and exit out of the industry, and (4) perfect knowledge of prices and technology. These four characteristics are essentially impossible to match in the real world.

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SUPPLY SHOCK

A disruption of market equilibrium caused by a change in a supply determinant and a shift of the supply curve. A supply shock can take one of two forms--a supply increase or a supply decrease. This is one of two disruptions of the market. The other is a demand shock.

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Today, you are likely to spend a great deal of time at a going out of business sale wanting to buy either a bottle of blackcherry flavored spring water or a travel case for you toothbrush. Be on the lookout for door-to-door salesmen.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
"Life is no brief candle to me. It is a sort of splendid torch which I have got a hold of for the moment, and I want to make it burn as brightly as possible before handing it on to future generations."

-- George Bernard Shaw

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