Un índice HHI por debajo de 0.01 (o 100) indica un los que el HHI es mayor a los 1800 puntos http://www.msci.com/products/indices/country_and_r. Post-merger Herfindahl-Hirschman Index: HHIpost = Pi s2 i s2. 1 s2. 2+(s1 + An index of HHI = 1800 corresponds to 5.6 equal-size firms. – A change of 50 in seen that the Herfindahl Hirschmann Index, an indicator  of market concentration, is at 548,97 where 1,000 indicates concentrated and 1,800 highly First we calculate Herfindahl-Hirschman (HHI) concentration indices for HPs and quarters of California counties exhibit HP concentration indices over 1,800, Herfindahl-Hirschmann Index (HHI) Economics & Business. a widely used agencies handling anti-trust issues consider a market with an HHI of 1800 or more Key words: market power, Lerner index, Herfindahl-Hirschman index, above 1800 show a very high concentration of the banking system, whereas the index
“The Herfindahl-Hirschman index (HHI) is a commonly accepted measure of market concentration. It is calculated by squaring the market share of each firm competing in a market, and then summing the resulting numbers. The U.S. Department of Justice uses the HHI for evaluating mergers.
What is the Herfindahl-Hirschman Index (HHI)? The Herfindahl-Hirschman Index is an index that measures the market concentration of an industry. A highly concentrated industry is one where only a few players in the industry hold a large percentage of the market share, leading to a near- monopolistic Monopolistic Competition situation. Since 1982, the U.S. Department of Justice, the Federal Trade Commission, and state attorneys general have used the Herfindahl-Hirschman Index (HHI) to measure market concentration for purposes of antitrust enforcement. The HHI of a market is calculated by summing the squares of the percentage market shares held by the respective firms. An HHI value of more than 1,800 is considered highly concentrated, and a post-merger increase of more than 50 points raises red flags with the DOJ. Using the HHI, any four-firm market share of 70 percent would fall in the moderate to highly concentrated category, depending on the distribution of individual market shares. The Herfindahl-Hirschman Index (HHI) is a common measure of market concentration that is used to determine market competitiveness. The Herfindahl Index takes into account a number of factors that give analysts and experts a better, more comprehensive view of the health of a specific market. When that market is populated by a lot of big companies, all of them relatively the same size, the index will be at or near zero.
la aplicación de Índices de Concentración Económica: índice de Herfindahl - Hirschman, índice de de la Construcción es alto, supera el valor de 1800 por lo .
The Herfindahl-Hirschman index, better known as the Herfindahl index, is a statistical measure of in a market of less than 1,800 or (2) in a change in the HHI of Potential legal challenge to merger. 1,800+, ≥ 50, Definite government challenge to merger. Note that a small change to HHI in a heavily concentrated industry