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PREFERENCES CHANGE, UTILITY ANALYSIS: A disruption of consumer equilibrium identified with utility analysis caused by changes in the preferences for a good, which likely results in a change in the quantities of the goods consumed. The change in preferences alters the marginal utility-price ratio and forces a reevaluation of the rule of consumer equilibrium.

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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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