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LERNER INDEX: The difference between price (p) and marginal cost (mc) as a fraction of price, that is [p-mc]/p. The Lerner index is usually taken as an indicator of market power because the larger the index, the larger the difference between price and marginal cost, that is, the larger the distance between the price and the competitive price. The Lerner index depends on the elasticity of demand. The Lerner index is also called the price-cost margin.

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KINKED-DEMAND CURVE

A demand curve with two distinct segments which have different elasticities that join to form a corner or 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 based on the interdependent decision-making of oligopolistic firms.

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Today, you are likely to spend a great deal of time looking for the new strip mall out on the highway trying to buy either a cross-cut paper shredder or a birthday greeting card for your father. Be on the lookout for slow moving vehicles with darkened windows.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
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