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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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AGGREGATE SUPPLY INCREASE, LONG-RUN AGGREGATE MARKET

A shock to the long-run aggregate market caused by an increase in aggregate supply, resulting in and illustrated by a rightward shift of the long-run aggregate supply curve. An increase in aggregate supply in the long-run aggregate market results in a decrease in the price level and an increase in real production. The level of real production resulting from the shock is a greater level of full-employment real production.

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Today, you are likely to spend a great deal of time wandering around the downtown area seeking to buy either clothing for your kitty cats or a set of luggage without wheels. Be on the lookout for the last item on a shelf.
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Only 1% of the U.S. population paid income taxes when the income tax was established in 1914.
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