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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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AVERAGE TOTAL COST CURVE A curve that graphically represents the relation between average total cost incurred by a firm in the short-run product of a good or service and the quantity produced. The average total cost curve is constructed to capture the relation between average total cost and the level of output, holding other variables, like technology and resource prices, constant. The average total cost curve is one of three average curves. The other two are average variable cost curve and average fixed cost curve. A related curve is the marginal cost curve.
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PURPLE SMARPHIN
[What's This?]
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 coffee cup commemorating the first day of spring or a printer that works with your stockpile of ink cartridges. Be on the lookout for strangers with large satchels of used undergarments.
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Before 1933, the U.S. dime was legal as payment only in transactions of $10 or less.
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"It had long since come to my attention that people of accomplishment rarely sat back and let things happen to them. They went out and happened to things. " -- Elinor Smith, aviator
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MPC
Marginal Propensity to Consume
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