Results 251 to 260 of about 401,207 (303)
Some of the next articles are maybe not open access.
Aggregate Concentration, Market Concentration and Diversification
The Economic Journal, 1983Studies of business concentration have traditionally focused on two alternative levels of aggregation. Overall, or aggregate, concentration is concerned with the extent to which the macro-economy (or broad sectors thereof) is dominated by the largest firms: this is commonly measured by the share of aggregate activity accounted for by the largest ioo ...
Clarke, R, Davies, S W
openaire +1 more source
Concentration, Price, and Critical Concentration Ratios
The Review of Economics and Statistics, 1981A potentially important parameter that has not yet been convincingly estimated is the critical concentration ratio. This paper attempts to estimate it in three types of market. The estimation of a critical concentration ratio, if one exists, seems of potentially great importance because of its implication for antitrust policy.
Geithman, Frederick E +2 more
openaire +1 more source
Practical concentrators attaining maximal concentration
Optics Letters, 1980A new class of radiation concentrators is described that achieve maximal concentration of radiation from a uniform source. Unlike ideal concentrators, which accept all radiation within a given acceptance angle and none outside, the new maximal concentration collectors may reject some radiation from within the nominal acceptance angle.
E, Harting, D R, Mills, J E, Giutronich
openaire +2 more sources
Concentrating on Concentration
The Journal of Portfolio Management, 2004Factor models seek to reduce the impact of spurious in-sample correlations on the estimation of a covariance matrix of security returns. Among U.S. equities, market value is concentrated in a small number of assets both across the market and within industry sectors. Over 50% of market value, for example, is captured by 1% of assets.
openaire +1 more source
Proceedings of the 12th ACM SIGACT-SIGPLAN symposium on Principles of programming languages - POPL '85, 1985
This paper considers current solutions to the problem of representing multiple environments, and uses the results to develop a new model. The motivation is partly a consequence of the renewed interest in the more sophisticated forms of access and control [Sussman & Steele 1978], [Smith 1983]. [Friedman et al.
Julian A. Padget, John P. Fitch
openaire +1 more source
This paper considers current solutions to the problem of representing multiple environments, and uses the results to develop a new model. The motivation is partly a consequence of the renewed interest in the more sophisticated forms of access and control [Sussman & Steele 1978], [Smith 1983]. [Friedman et al.
Julian A. Padget, John P. Fitch
openaire +1 more source
Institutions and concentration
Journal of Development Economics, 2006Abstract In a new dataset of 1.3 million firms from over 100 countries, I establish a number of regularities in cross-country differences in economic concentration. Concentration of sales and employment is substantially higher in smaller countries and in less-developed countries; these two factors alone explain roughly half the cross-country ...
openaire +1 more source
British Journal of Psychiatry, 1966
Introduction“I can't concentrate, doctor” is a common complaint among psychiatric patients. The phrase is usually applied in a general sense to describe a state in which the patient has ceased to read the newspapers or watch the television and can no longer cope adequately with his work.
F G, Spear, R, Green
openaire +2 more sources
Introduction“I can't concentrate, doctor” is a common complaint among psychiatric patients. The phrase is usually applied in a general sense to describe a state in which the patient has ceased to read the newspapers or watch the television and can no longer cope adequately with his work.
F G, Spear, R, Green
openaire +2 more sources
Market Concentration and Concentrations in Retail
2012In the retail industry in Europe there is an ongoing trend of market consolidation by rapid growth of the large international retail companies. Undergoing process of retail market concentration is bringing new challenges to all market participants: suppliers (such as: production industry, wholesalers and logistic companies), existing retailers and ...
Knežević, Blaženka, Jagić, Tea
openaire +1 more source
Concentrating on the claustrum
Nature Reviews Neuroscience, 2018Two studies show that the claustrum delivers inhibition to different parts of the cortex — the prefrontal cortex and auditory cortex.
openaire +2 more sources
The Journal of Industrial Economics, 1977
DESPITE a decade of study, economists have been unable to agree on advertising's impact on concentration. Telser [I9], [20], Ekelund, Gramm, and Maurice [5], [6], [7] argue that advertising has no effect on concentration. Mann, Henning, and Meehan [I o], [I I], [I2], [I3] contend that the two are intimately connected.
openaire +1 more source
DESPITE a decade of study, economists have been unable to agree on advertising's impact on concentration. Telser [I9], [20], Ekelund, Gramm, and Maurice [5], [6], [7] argue that advertising has no effect on concentration. Mann, Henning, and Meehan [I o], [I I], [I2], [I3] contend that the two are intimately connected.
openaire +1 more source