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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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EMPIRICAL Based on or relating to the collection or analysis of real world data. The term empirical is commonly used as a modifier to provide contrast with theoretical. Whereas theoretical refers to abstract representations, empirical indicates actual real world observations.
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Woodrow Wilson's portrait adorned the $100,000 bill that was removed from circulation in 1929. Woodrow Wilson was removed from circulation in 1924.
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"There is no point at which you can say, „Well, I'm successful now. I might as well take a nap.¾" -- Carrie Fisher, actress, writer
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JE
Journal of Econometrics
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