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FIFTH RULE OF IMPERFECTION: The fifth of seven basic rules of the economy. It is the observation that the real world is not perfect. This means markets often fail to achieve efficiency because of several failings. This also means that government seldom enacts the policies needed to correct market failings. We are usually faced with the lesser of evils.

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KINKED-DEMAND CURVE ANALYSIS

An analysis using the kinked-demand curve to explain rigid prices often found with oligopoly. 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. Key to this analysis is that the corresponding marginal revenue curve contains three segments--one associated with the more elastic segment, one associated with the less elastic segment, and one associated with the kink. A profit-maximizing firm can then equate marginal cost to a wide range of marginal revenue values along the vertical segment of the marginal revenue curve. This suggests that marginal cost must change significantly before an oligopolistic firm is inclined to change price.

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Today, you are likely to spend a great deal of time searching the newspaper want ads looking to buy either storage boxes for your family photos or a large, stuffed giraffe. Be on the lookout for telephone calls from long-lost relatives.
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Three-forths of the gold mined each year is used to manufacture jewelry.
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