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THREE-SECTOR KEYNESIAN MODEL: A model used to identify equilibrium in Keynesian economics based on aggregate expenditures by the three domestic sectors (household, business, and government). Equilibrium is achieved at the intersection of the aggregate expenditures line, AE = C + I + G, and the 45-degree line, Y = AE. This is Keynesian aggregate expenditures model can be used to analyzed the impact of government fiscal policy on aggregate expenditures and equilibrium.

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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 at an auction hoping to buy either storage boxes for your income tax returns or an AC adapter for your CD player. Be on the lookout for door-to-door salesmen.
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The 22.6% decline in stock prices on October 19, 1987 was larger than the infamous 12.8% decline on October 29, 1929.
"Whenever you see a successful business, someone once made a courageous decision."

-- Peter F. Drucker, business strategist

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Kullback-Leibler Information Criterion
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