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July 13, 2025 

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PERFECT COMPETITION, SHUTDOWN: A perfectly competitive firm is presumed to shutdown production and produce no output in the short run, if price is less than average variable cost. This is one of three short-run production alternatives facing a firm. The other two are profit maximization (if price exceeds average total cost) and loss minimization (if price is greater than average variable cost but less than average total cost).

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CONCENTRATION RATIO: The proportion of total output in an industry that's produced by a given number of the largest firms in the industry. The two most common concentration ratios are for the four largest firms and the eight largest firms. The four-firm concentration ratio, as such, is the proportion of total output produced by the four largest firms in the industry and the eight-firm concentration ratio is proportion of total output produced by the eight largest firms in the industry.

     See also | industry | firm | market share | market control | four-firm concentration ratio | eight-firm concentration ratio | oligopoly | monopolistic competition | market structure |


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CONCENTRATION RATIO, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2025. [Accessed: July 13, 2025].


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CHANGE IN AGGREGATE SUPPLY

A shift of the short-run or long-run aggregate supply curve caused by a change in one of the aggregate supply determinants. In essence, a change in aggregate supply is caused by any factor affecting supply EXCEPT the price level. This is one of two changes related to aggregate supply. The other is a change in real production. A change in aggregate supply is comparable to a change in market supply.

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Today, you are likely to spend a great deal of time driving to a factory outlet trying to buy either rechargeable batteries or a rechargeable battery for your computer. Be on the lookout for neighborhood pets, especially belligerent parrots.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
"To sit back and let fate play its hand out, and never influence it, is not the way man was meant to operate."

-- John Glenn, astronaut, U.S. senator

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Association of International Bond Dealers (now called International Securities Market Association)
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