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HERFINDAHL INDEX: 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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INFLATION RATE

The percentage change in the price level from one period to the next. The inflation rate is most commonly presented as an annual average, the percentage change in the average price level from one year to the next. The two most common price indexes used to measure the price level and the inflation rate are the Consumer Price Index (CPI) and the GDP price deflator. The inflation rate is one of several key indicators of business-cycle instability and the overall health of the macroeconomy, with primary focus on tracking the goal of price stability.

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Today, you are likely to spend a great deal of time at a flea market looking to buy either a package of 4 by 6 index cards, the ones with lines or a 50 foot extension cord. Be on the lookout for the last item on a shelf.
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Two and a half gallons of oil are needed to produce one automobile tire.
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