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AD-AS MODEL: An economic model relating the price level and real production that is used to analyze business cycles, gross domestic product, unemployment, inflation, stabilization policies, and related macroeconomic phenomena. The AS-AD model, inspired by the standard market model, captures the interaction between aggregate demand (the buyers) and short-run and long-run aggregate supply (the sellers).

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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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APLS

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Today, you are likely to spend a great deal of time searching for a specialty store trying to buy either a birthday gift for your grandmother or a T-shirt commemorating yesterday. Be on the lookout for telephone calls from long-lost relatives.
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Sixty percent of big-firm executives said the cover letter is as important or more important than the resume itself when you're looking for a new job
"Lord, where we are wrong, make us willing to change; where we are right, make us easy to live with. "

-- Peter Marshall, US Senate chaplain

LRMC
Long Run Marginal Cost
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