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May 10, 2026 

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KINKED-DEMAND CURVE: A demand curve with two distinct segments with different elasticities that join to form a kink. The primary use of the kinked-demand curve is to explain price rigidity in oligopoly. The two segments are: (1) a relatively more elastic segment for price increases and (2) a relatively less elastic segment for price decreases. The relative elasticities of these two segments is directly based on the interdependent decision-making of oligopolistic firms.

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PERFECT COMPETITION, REALISM: Perfect competition is an idealized market structure that does NOT exist in the real world. While some real world industries might come relatively close to one or two of the four key characteristics of perfect competition, none matches all four sufficiently that they can be declared PERFECTLY competitively. Some industries come close on the large number of small firms and the identical product characteristics. A few industries have relatively good, although not perfect, information about prices and technology. However, almost all industries fall far short of the perfect mobility characteristics.

     See also | perfect competition | perfect competition, characteristics | perfect competition, efficiency | perfect competition, demand |


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AUTONOMOUS NET EXPORTS

Net exports by the foreign sector that do not depend on income or production (especially national income or gross domestic product). That is, changes in income do not generate changes in net exports. Autonomous net exports are best thought of as net exports that the foreign sector undertakes independent of income. They are measured by the intercept term of the net exports line. The alternative to autonomous net exports is induced net exports, which do depend on income.

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