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DECISION LAG: In the context of economic policies, a part of the implementation lag involving the time it takes for policy makers to determine the appropriate policy to undertake. Another part of the implementation lag is the action lag. For fiscal policy, this involves Congress and the President debating, passing, and signing legislation that changes government spending or taxes. For monetary policy, this involves a meeting among the members of the Federal Reserve Open Market Committee. The decision lag is usually shorter for monetary policy than fiscal policy.

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4-FIRM CONCENTRATION RATIO: The proportion of total output in an industry that's produced by the four largest firms in the industry. This is one of two common concentration ratios. The other is the eight-firm concentration ratio. The four-firm concentration ratio is commonly used to indicate the degree to which an industry is oligopolistic and how market control is held by the four largest firms in the industry.

     See also | concentration ratio | 8-firm concentration ratio | market share | market control | oligopoly | monopolistic competition |


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AGGREGATE EXPENDITURES

The total expenditures on gross domestic product undertaken in a given time period by the four sectors--household, business, government, and foreign. Expenditures made by each of these sectors are commonly termed consumption expenditures, investment expenditures, government purchases, and net exports. Aggregate expenditures (AE) are a cornerstone in the study of macroeconomics, playing critical roles in Keynesian economics, aggregate market analysis, and to a lesser degree, monetarism. In particular, aggregate expenditures are combined with the price level as aggregate demand.

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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 wanting to buy either a how-to book on home remodeling or a tall storage cabinet with five shelves and a secure lock. Be on the lookout for the last item on a shelf.
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