Concentration index economics

'The critical choice between the concentration ratio and the. H-index in assessing industry performance', Journal of Industrial Economics, Vol. 35(2), pp. 193–208.

May 6, 2016 56. The Herfindahl-Hirschmann index (HHI) is widely used to measure market concentration and also economic diversity. It is further used for  The concentration ratio, in economics, is a ratio that indicates the size of firms in relation to their industry as a whole. Low concentration ratio in an industry would indicate greater competition among the firms in that industry, compared to one with a ratio nearing 100%, which would be evident in an industry The concentration index is defi ned with reference to the concentration curve, intro-duced in chapter 7. The concentration index is defi ned as twice the area between the concentration curve and the line of equality (the 45-degree line). So, in the case in which there is no socioeconomic-related inequality, the concentration index is zero. Higher values of the index indicate higher market concentration and monopoly power as well as decreased competitiveness. For example, if there is only one firm in a market with 100 percent market share, then the value of the index would equal 10,000 (100 2). The index decreases when a market is made up of a larger number of firms, each with a smaller market share.

MEASURES OF CONCENTRATION there are many changes in the position of the curve that leave the index unchanged. The lack of a summary measure utilizing all points on the curve has therefore been lamented6 and even offered as an argument for using a different concept of concentration. But summary measures can be devised to measure concentration, just as

Economic Concentration Index (UNCTAD) This is a measure of how much a country's economy (and trade) are concentrated in one or a few products, with higher numbers indicating more concentration. Register to create your own interactive chart | Login » The concentration in Economics prepares students for graduate study in fields such as business and law, for graduate study leading to teaching and research in economics, and can be a steppingstone to employment in business, finance, non-profit, and government organizations. Students may choose either the standard or the professional track. Industrial concentration was traditionally summarized by the concentration ratio, which simply adds the market shares of an industry’s four, eight, twenty, or fifty largest companies. In 1982, when new federal merger guidelines were issued, the Herfindahl-Hirschman Index (HHI) became the standard measure of industrial concentration. MEASURES OF CONCENTRATION there are many changes in the position of the curve that leave the index unchanged. The lack of a summary measure utilizing all points on the curve has therefore been lamented6 and even offered as an argument for using a different concept of concentration. But summary measures can be devised to measure concentration, just as

The most common measure to calculate the market concentration is the Herfindahl-Hirschman Index (HHI). This index is calculated by adding the square root of the percentage market share of each individual firm in the industry.

Jun 14, 2019 Socio-economic inequality in unhealthy snacks consumption among adolescent students in Iran: a concentration index decomposition analysis  Feb 18, 2020 But this concentration ratio approach has an obvious problem. An industry where the four top firms each had 20% of the market would have the  'The critical choice between the concentration ratio and the. H-index in assessing industry performance', Journal of Industrial Economics, Vol. 35(2), pp. 193–208. shaded green are the ones where you have relatively low Gini indices or Gini coefficients, and so that would be indicative of reasonably low income inequality.

Apr 27, 2012 One specific application is in competition economics, where concentration indices are used to provide a first insight into levels of competition in 

conindex: Estimation of concentration indices. Owen O'Donnell Erasmus School of Economics Erasmus University Rotterdam, the Netherlands Tinbergen Institute ,  We focus on three main indicators of market power in and across countries: namely, the concentration ratios, the markup and the degree of economic dynamism. In Health Economics, the concentration index approach has since the 1990's become the standard tool to evaluate socioeconomic inequalities in health. As the  Repetitive values of the ranking indicators of economic welfare are often introduced due to incidental ties or censoring in the welfare variable, or the categorical  Jun 6, 2019 The Herfindahl Index, also known as the Herfindahl-Hirschman Index (HHI), measures the market concentration of an industry's 50 largest firms in where there is only one provider of a certain economic good or service. The Appendix discusses the Lerner index. Page 9. Measures of Competition and Concentration. Economic & Financial Modelling • Summer 2002. Export product concentration index in Ethiopia was reported at 0.36122 in 2011, according to the World Bank collection of development indicators, compiled 

Concentration indices measure inequality in one variable over the distribution of Brendan Walsh is a Research Fellow in Health Economics in the School of 

The concentration ratio, in economics, is a ratio that indicates the size of firms in relation to their industry as a whole. Low concentration ratio in an industry would indicate greater competition among the firms in that industry, compared to one with a ratio nearing 100%, which would be evident in an industry The concentration index is defi ned with reference to the concentration curve, intro-duced in chapter 7. The concentration index is defi ned as twice the area between the concentration curve and the line of equality (the 45-degree line). So, in the case in which there is no socioeconomic-related inequality, the concentration index is zero. Higher values of the index indicate higher market concentration and monopoly power as well as decreased competitiveness. For example, if there is only one firm in a market with 100 percent market share, then the value of the index would equal 10,000 (100 2). The index decreases when a market is made up of a larger number of firms, each with a smaller market share. The Herfindahl-Hirschman Index (HHI) This is a measure of market concentration. The index is calculated by squaring the % market share of each firm in the market and summing these numbers. For example in a market consisting of only four firms with shares of 30%, 30%, 20% and 20% the Herfindahl Index would be 2600 (900 + 900+ 400+ 400).

Concentration index for the whole sample. Because of the small sample sizes in certain subgroups (for example, medium and high income groups among blacks in NHANES I and II), standard errors were large compared with the prevalence rate. This was a limitation of using socio-economic categories based on tertiles. The concentration index has become the standard measure to quantify income-related inequalities in health economics (Wagstaff and van Doorslaer, 2000). It can be estimated using grouped/aggregated data or micro-data sets that contain information on an individual's income and his/her health (care) status. Concentration Ratios. The following data are from the Economic Census. All of these reports classify industries by the percent of output accounted for by the largest 4, 8, 20 and 50 companies. Only the manufacturing reports include the Herfindahl-Hirschman Index. Economic Concentration Index (UNCTAD) This is a measure of how much a country's economy (and trade) are concentrated in one or a few products, with higher numbers indicating more concentration. Register to create your own interactive chart | Login » The concentration in Economics prepares students for graduate study in fields such as business and law, for graduate study leading to teaching and research in economics, and can be a steppingstone to employment in business, finance, non-profit, and government organizations. Students may choose either the standard or the professional track.