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HERFINDAHL-HIRSHMAN 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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SCARCE GOOD

A tangible item produced with society's limited resources for the purpose of satisfying wants and needs. As a general notion, the phrase scarce good can also commonly include intangible services produced with society's limited resources for the purpose of satisfying wants and needs. A synonymous term for scarce good is economic good.

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Today, you are likely to spend a great deal of time at a garage sale hoping to buy either a wall poster commemorating yesterday or pink cotton balls. Be on the lookout for deranged pelicans.
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Two and a half gallons of oil are needed to produce one automobile tire.
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