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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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PERFECTLY ELASTIC: An elasticity alternative in which infinitesimally small changes in price cause infinitely large changes in quantity. In other words, quantity is hyper, super, infinitely responsive to price. Any change in price, no matter how small triggers an infinite change in quantity. Perfectly elastic should be compared with other elasticity alternatives--perfectly inelastic, relatively elastic, relatively inelastic, and unit elastic.

     See also | elasticity | perfectly inelastic | relatively inelastic | relatively elastic | unit elastic | price elasticity of demand | price elasticity of supply |


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PERFECTLY ELASTIC, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2025. [Accessed: July 18, 2025].


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INDETERMINANT

The directional change in a variable, resulting from the disruption of an equilibrium that is identified using comparative statics, is not known. This term is commonly used to indicate that the change in either price or quantity is unknown when the market experiences simultaneous shifts in both the demand and supply curves. For example, an increase in both demand and supply definitely cause an increase in the quantity exchanged. But whether the market price increases or decreases is indeterminant.

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Today, you are likely to spend a great deal of time wandering around the downtown area trying to buy either shoe laces for your snow boots or a rim for your spare tire. Be on the lookout for the happiest person in the room.
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The average length of a "business lunch" is about 36 minutes.
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Journal of Industrial Economics
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