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November 15, 2025 

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MARKET STRUCTURE CONTINUUM: A diagram illustrating alternative degrees of market control held by different types of market structures based on the number of firms in the market and the degree of competitiveness. As the number of competitors along the continuum ranges from one to many, the degree of market control ranges complete to none. At one end of the continuum, with many competitors on no market control, is perfect competition. At the other end, with one competitor and complete market control, is monopoly. Oligopoly and monopolistic competition comprise the interior of the continuum, with monopolistic competition having many competitors but limited market control and oligopoly having few competitors and greater market control. The continuum illustrates that clear-cut dividing lines really do not exist between the market structures, especially for monopolistic competition and oligopoly.

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UNSTABLE EQUILIBRIUM: An equilibrium that is NOT restored if disrupted by an external force. This should be contrasted with stable equilibrium. While most equilibria studied in economics are of the stable variety, a few cases of unstable equilibria do emerge from time to time, in limited circumstances.

     See also | equilibrium | stable equilibrium | market | shortage | surplus |


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UNSTABLE EQUILIBRIUM, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2025. [Accessed: November 15, 2025].


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REGRESSIVE TAX

A tax in which the proportion of income paid in taxes is smaller for higher income levels. A regressive income tax exists if taxpayers with more income pay a lower tax rate relative to income as income increases. A regressive tax is one of three alternations. The other two are progressive tax, in which the proportion of income paid in taxes is greater for higher income levels, and proportional tax, in which the proportion of income paid in taxes is the same for all income levels.

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BROWN PRAGMATOX
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Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club seeking to buy either a rechargeable battery for your computer or shoe laces for your snow boots. Be on the lookout for jovial bank tellers.
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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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