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EQUILIBRIUM: The state that exists when opposing forces exactly offset each other and there is no inherent tendency for change. Once achieved, an equilibrium persists unless or until it is disrupted by an outside force.

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SUBSTITUTION EFFECT: One of two reasons for law of demand and the negative slope of the market demand curve (the other is the income effect). The substitution effect occurs because a change in the price of a good makes it relatively higher or lower than the prices of other goods that might act as substitutes. A higher price means that a good is more expensive relative to other goods, while a lower price means it's less expensive.

     See also | demand | demand curve | law of demand | slope | quantity demanded | income effect | demand price | substitute |


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SUBSTITUTION EFFECT, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2026. [Accessed: January 21, 2026].


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OLIGOPOLY, CONCENTRATION

Oligopoly is a market structure that contains a small number of relatively large firms, meaning oligopoly markets tend to be concentrated. A small number of large firms account for a majority of total output. Concentration unto itself is not necessarily bad, but it often leads to inefficient behavior, such as collusion and nonprice competition. Concentration is measured in three ways--market share, concentration ratio, Herfindahl index.

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