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December 11, 2025 

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VERY SHORT RUN, MICROECONOMICS: A production period of time in which at all inputs in the production process are fixed, meaning the quantity of output itself is fixed. Also termed market period, the very short run exists if the period is so short that no additional production is possible. In other words, the good has been produced, all that remains is to sell it. This is one of four production time periods used in the study of microeconomics. The other three are short run, long run, and very long run.

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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: December 11, 2025].


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SUPPLY SPACE

The area on or above a supply curve that indicates all possible price-quantity combinations acceptable to sellers. Buyers are willing and able to purchase any price-quantity combination that places them on or above the supply curve, but not above.

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BLACK DISMALAPOD
[What's This?]

Today, you are likely to spend a great deal of time going from convenience store to convenience store looking to buy either throw pillows for your bed or a package of blank rewritable CDs. Be on the lookout for strangers with large satchels of used undergarments.
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Al Capone's business card said he was a used furniture dealer.
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PVR
Profit Volume Ratio
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