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January 22, 2019 

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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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INSIDE LAG: In the context of economic policies, the time between a shock to the economy and corrective government action responding to the shock. This is one of two primary lags in the use of economic policies. The other is outside lag, the time between the government action and the affect on the economy. The inside lag can be divided into the recognition lag and the implementation lag. The recognition lag is identifying the shock or need for action and the implementation is determining the appropriate policy response. Monetary policy tends to have a shorter outside lag than fiscal policy. The length of the inside and outside lags is one argument against the use of discretionary policies to stabilize business cycles.

     See also | economic policies | policy lags | outside lag | recognition lag | implementation lag | leading economic indicator | business cycle | monetary policy | fiscal policy |


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ASYMMETRIC INFORMATION

Information is not equally available to everyone. Asymmetric information results because efficient information search inevitably stops short of compete information. Some people obtain more benefits from information than others, are willing to incur higher search costs, and thus end up knowing more. Or they incur lower information search costs and have easier access to the information. In a market, sellers tend to have more information about the good than buyers. Asymmetric information gives rise to adverse selection, moral hazard, and the principal-agent problem. These problems can be lessened through signalling and screening.

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