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KINKED-DEMAND CURVE ANALYSIS: An analysis that seeks to explain rigid oligopolistic prices using the kinked-demand curve. The kinked demand curve contains two distinct segments, one for higher prices that is more elastic and one for lower prices that is less elastic. The corresponding marginal revenue curve contains a vertical segment at the existing or initial quantity. Because a profit-maximizing oligopolistic firm equates marginal cost to marginal revenue, marginal cost also can take on a range of values at the existing quantity. In other words, marginal cost can increase or decrease without inducing a profit-maximizing oligopolistic firm to change price or quantity.

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PERFECT COMPETITION

An ideal market structure characterized by a large number of small firms, identical products sold by all firms, freedom of entry into and exit out of the industry, and perfect knowledge of prices and technology. This is one of four basic market structures. The other three are monopoly, oligopoly, and monopolistic competition. Perfect competition is an idealized market structure that is not observed in the real world. While unrealistic, it does provide an excellent benchmark that can be used to analyze real world market structures. In particular, perfect competition efficiently allocates resources.

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Today, you are likely to spend a great deal of time browsing about a thrift store seeking to buy either one of those "hang in there" kitty cat posters or a velvet painting of Elvis Presley. Be on the lookout for vindictive digital clocks with revenge on their minds.
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The first "Black Friday" on record, a friday marked by a major financial catastrophe, occurred on September 24, 1869 -- A FRIDAY -- when an attempted cornering of the gold market induced a financial crises and economy-wide depression.
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