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SHORTAGE: A condition in the market in which the quantity demanded is greater than the quantity supplied at the existing price. A shortage occasionally goes by the terms excess demand and sellers' market. A shortage causes an increase in the equilibrium price.

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FOUR-FIRM CONCENTRATION RATIO

The proportion of total output in an industry produced by the four largest firms in an industry. This is one of two common concentration ratios. The other is the eight-firm concentration ratio. Another related measure is the Herfindahl index. The four-firm concentration ratio is commonly used to indicate the degree to which an industry is oligopolistic and the extent of market control held by the four largest firms in the industry.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs hoping to buy either a computer that can play music and burn CDs or a T-shirt commemorating last Friday (you know why). Be on the lookout for crowded shopping malls.
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Potato chips were invented in 1853 by a irritated chef repeatedly seeking to appease the hard to please Cornelius Vanderbilt who demanded french fried potatoes that were thinner and crisper than normal.
"The majority of men meet with failure because of their lack of persistence in creating new plans to take the place of those that fail. "

-- Napoleon Hill, author

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Journal of Economic Theory
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