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HHI: The common abbreviation for the Herfindahl-Hirshman index (or the Herfindahl index), which is a measure of concentration of the production in an industry that's calculated as the sum of the squares of market shares for each firm. This is an alternative method of summarizing the degree to which an industry is oligopolistic and the relative concentration of market power held by the largest firms in the industry. The Herfindahl index gives a better indication of the relative market control of the largest firms than can be found with the four-firm and eight-firm concentration ratios.

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SLOPE, LONG-RUN AGGREGATE SUPPLY CURVE

The long-run aggregate supply (LRAS) curve is a vertical line with an infinite slope, reflecting the independent relation between the price level and aggregate real production. A higher price level is associated with the same real production as a lower price level. This is the real production generated when resources are fully employed, that is, full-employment production.

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Today, you are likely to spend a great deal of time at a flea market looking to buy either a T-shirt commemorating next Thursday or a birthday gift for your uncle. Be on the lookout for cardboard boxes.
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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.
"I not only use all the brains that I have, but all that I can borrow. "

-- Woodrow Wilson, 28th US president

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