| 单词 | Herfindahl index |
| 释义 | Herfindahl index An index of concentration in an industry. The index calculates the sum over all firms of the squares of their market shares, expressed as proportions. Thus H = ∑i s2, where si is the market share of the ith firm. If there are N firms, the lowest value H can take is when all N firms have equal shares, so that si = 1/N for all i, and H = N(1/N2) = 1/N. The highest value H can take is 1, which is approached as the market share of the largest firm tends to 1 and the market shares of the rest tend to zero. H thus rises as concentration increases. |
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