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March 26, 2025 

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MARKET SHARE: The fraction of an industry's total sales accounted for by a single business. In general, market share is a "first-guess" indicator of a firm's market control. If, for example, a company has a market share of 100 percent (that is, a monopoly), then you can rest assured it has a substantial amount of market control. A company with a 25 percent market share has less, but still notable, market control. In fact, when you get right down to the bottom line, the phrase "market share" is only worth mentioning for oligopolistic firms with a significant degree of market control. There really is no market control for a monopolistically competitive firm with a 0.00000001 percent market share.

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ENDOGENOUS VARIABLE: A variable that is identified within the workings of the model. Also termed a dependent variable, an endogenous variable is in essence the "output" of the model. It should be compared with an exogenous variable this is the "input" of the model.

     See also | variable | model | exogenous variable | economic analysis | comparative statics | abstraction |


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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. Because buyers are unable to buy as much of the good as they want, a shortage generally causes an increase in the market price, which then acts to restore equilibrium. A shortage, which also goes by the terms excess demand and sellers' market, is one of two basic states of disequilibrium for the market. The other is surplus.

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ORANGE REBELOON
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Today, you are likely to spend a great deal of time at an auction trying to buy either one of those "hang in there" kitty cat posters or a velvet painting of Elvis Presley. Be on the lookout for neighborhood pets, especially belligerent parrots.
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Paper money used by the Commonwealth of Massachusetts prior to the U.S. Revolutionary War, which was issued against the dictates of Britain, was designed by patriot and silversmith, Paul Revere.
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