我国财产险市场各险种的市场集中度分析

利用熵指数、赫芬达尔指数和秩—规模函数法分析了2002~2003年国内财产险市场各险种的市场集中度问题。实证发现,熵指数和赫芬达尔指数对业务集中度的排序基本上一致,但秩—规模函数法下的结论与前两种方法明显不同。这是由于秩—规模函数侧重考虑市场份额分布的有偏性,而熵指数法对份额较小的公司给予了较高的权重,赫芬达尔指数法对份额较大的公司给予了较高的权重。

Market Concentration Analysis for Product Lines of Chinese Non- life Insurance

Based on the Theil's entropy,Herfindahl index and rank-size function,the paper discussed the market concentration of Chinese non-life insurance for year 2002 and 2003.Empirical study found that the rank the lines for the level of concentration using Theil's entropy and Herfindahl index tend to be the same,while conclusion from rank-size function differed significantly.This is because the rank-size function considers specifically the skew of market share distribution.Entropy,on the other hand,gives higher weights to the smaller firms,while Herfindahl gives higher weights to larger firms.