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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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AUTONOMOUS INVESTMENT

Business investment expenditures that do not depend on income or production (especially national income or even gross domestic product). That is, changes in income do not generate changes in investment. Autonomous investment is best thought of as investment that the business sector undertakes regardless of the state of the economy. It is measured by the intercept term of the investment line. The alternative to autonomous investment is induced investment, which does depend on income.

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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius 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 spoiled cheese hiding under your bed hatching conspiracies against humanity.
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In the early 1900s around 300 automobile companies operated in the United States.
"He, who every morning plans the transactions of the day, and follows that plan, carries a thread that will guide him through a labyrinth of the most busy life."

-- Victor Hugo, Writer

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