concentration ratio


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Fig. 29 Concentration ratio. Market A is here highly concentrated, with the four largest firms accounting for 80% of market sales, while market B has a relatively low level of concentration.

concentration ratio

a measure of the degree of SELLER CONCENTRATION in a MARKET. The concentration ratio shows the percentage of market sales accounted for by, for example, the largest four firms or largest eight firms. The concentration ratio is derived from the market concentration curve, which can be plotted on a graph, with the horizontal scale showing the number of firms cumulated from the largest size and the vertical scale showing the cumulative percentage of market sales accounted for by particular numbers of firms. See CONCENTRATION MEASURES, MARKET STRUCTURE.
References in periodicals archive ?
For each ventilation scenario, an annual average concentration ratio of 1.0 in the calculations indicates acceptable indoor air quality with regard to chronic health standards.
The concentrations of methadone were 10-fold to 20-fold greater than for EDDP, with a mean EDDP/methadone concentration ratio of 0.11 (0.06).
Application of concentration ratio, which takes into consideration market shares of the participants, has resulted in the statement that in Croatian banking system the two largest banks dominate the system (Subic, 2009).
Concentration ratios (mostly used among discrete concentration measures) are measures of the total output that is produced in an industry (the concentration ratio of an industry is used as an indicator of the relative size of firms in relation to the industry as a whole) by a given number of firms in the industry.
As a comparison with regression models, we used a first-order, single-compartment pharmacokinetic model to estimate the serum:drinking-water concentration ratio at steady state.
The studies that analyzed the industry factors (i.e., Cavusgil & Zou, 1994; Zhao & Zou, 2002) have mainly focused on technological intensity, concentration ratio, and location effects.
The 1,483-ton Keifu Maru and the 1,380-ton Ryofu Maru will be deployed in the Pacific around Japan and the East China Sea until April 23 and May 7, respectively, to monitor the concentration ratio of CO2 in the atmosphere and sea as well as water temperature and marine currents, the agency said.
In particular, structural breaks in the concentration ratio of the top-4 firms, in the number of subsidiaries for the top-4 firms, and in the HHI measures in the mid-1990s are matched by a structural break in the number of mergers in the U.S.
Another ratio of importance is the solar concentration ratio: the ratio of the diameter of the mirror to the diameter of the target (the cooking pot or kettle).
The first two measures examine the degree of non-uniformity in the distribution of the patients' residence across the HAs; they are called the concentration ratio and the index of concentration.
The concentrations (mean [+ or -] SD) of OC in duplicate CSF and plasma samples were 18.3 [+ or -] 0.9 ng/mL and 143.8 [+ or -] 3.3 ng/mL, respectively; the CSF/plasma concentration ratio was 12%-13%.
The important reaction variables of concentration level, concentration ratio of diamine to acid chloride, rate of removal of polymer film (in the case of unstirred reactors) or stirring speed, and stirrer geometry (in the case of stirred reactors) (3) determine the diamine and diacid chloride transfer rates.

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