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ACTION LAG: In the context of economic policies, a part of the implementation lag involving the time it takes for appropriate policies to be launched once they have been agreed to by policy makers. Another part of the implementation lag is the decision lag. For fiscal policy, this involves appropriating funds to government agencies (for government spending) or changing the tax code (for taxes) For monetary policy, this involves the buying and selling government securities in the open market. The action lag is usually shorter for monetary policy than fiscal policy.

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FOUR-FIRM CONCENTRATION RATIO

The proportion of total output in an industry produced by the four largest firms in an industry. This is one of two common concentration ratios. The other is the eight-firm concentration ratio. Another related measure is the Herfindahl index. The four-firm concentration ratio is commonly used to indicate the degree to which an industry is oligopolistic and the extent of market control held by the four largest firms in the industry.

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Today, you are likely to spend a great deal of time strolling through a department store wanting to buy either a handcrafted bird feeder or a New York Yankees baseball cap. Be on the lookout for slightly overweight pizza delivery guys.
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Three-forths of the gold mined each year is used to manufacture jewelry.
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