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RECESSIONARY GAP, KEYNESIAN MODEL: The difference between equilibrium aggregate production achieved in the Keynesian model and full-employment aggregate production that occurs when equilibrium aggregate production is less than full-employment aggregate production. A recessionary gap, also termed a contractionary gap, is associated with a business-cycle contraction. The prescribed Keynesian remedy for a recessionary gap is expansionary fiscal policy. This is one of two alternative output gaps that can occur when equilibrium generates production that differs from full employment. The other is an inflationary gap.

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CONCENTRATION RATIOS

A family of measures of the proportion of total output in an industry that is produced by a given number of the largest firms in the industry. The two most common concentration ratios are for the four largest firms and the eight largest firms. The four-firm concentration ratio is the proportion of total output produced by the four largest firms in the industry and the eight-firm concentration ratio is proportion of total output produced by the eight largest firms in the industry. Concentration ratios are commonly used to indicate the degree to which an industry is oligopolistic and the extent of market control of the largest firms in the industry. A related measure is the Herfindahl index.

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Today, you are likely to spend a great deal of time browsing about a thrift store seeking to buy either a handcrafted spice rack or a cell phone case. Be on the lookout for fairy dust that tastes like salt.
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The 1909 Lincoln penny was the first U.S. coin with the likeness of a U.S. President.
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