March 23, 2018 

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PERFECT COMPETITION AND EFFICIENCY: Perfect competition is the idealized market structure that achieves an efficient allocation of resources. The conditions of perfect competition, including (1) large number of small firms, (2) identical products sold by all firms, (3) freedom of entry into and exit out of the industry, and (4) perfect knowledge of prices and technology, ensure that perfect competition efficiently allocates resources. This is in fact the purpose of perfect competition: a market structure that illustrates perfection, the best of all possible resource allocation worlds. The real world falls short of this perfection.

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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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A curve that graphically represents the relation between the marginal revenue received by a firm for selling its output and the quantity of output sold. A firm maximizes profit by producing the quantity of output found at the intersection of the marginal revenue curve and marginal cost curve. The marginal revenue curve for a firm with no market control is horizontal. The marginal revenue curve for a firm with market control is negatively sloped and lies below the average revenue curve.

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Today, you are likely to spend a great deal of time searching the newspaper want ads wanting to buy either a birthday gift for your uncle or a pair of red and purple designer socks. Be on the lookout for mail order catalogs with hidden messages.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
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