Econometric Analysis of Non-life Insurance Industry : Changes in the Post-war Insurance System in Japan

产业组织理论并不是一个全新的领域，我们已经有很多关于几个产业的论文。然而，运用标准计量经济学方法研究日本非寿险业的论文并不多见。本文的目的是弥补这一差距，采用传统的计量经济学方法对日本非寿险业进行研究。虽然我们有计量经济学的历史研究和横截面分析，但没有横截面和时间序列的方法。在本研究中，我们尽可能收集了战后的数据，并对个别保险公司的数据进行了调查。然后我们试图了解战后非寿险业的全貌。本文的研究方法是建立一个面板数据库，运用传统的统计分析方法和传统的计量经济学方法对产业组织进行研究。运用面板数据的计量经济学方法，揭示了战后非寿险业的一些特征.我们得到了有趣的结果，可以用来检查每个保险公司的战略。在完成这项研究后，我们有可能比较寿险和非寿险行业。这两个行业长期以来一直受到财务省的监管和监督。顺便说一句，现在在日本，我们遇到了非人寿保险业的巨大变化。我们正处于保险制度转型的时代，特征自然会发生变化。在不久的将来，在增加数据后，我们想重新审视产业组织的变化。本研究的结果是这一研究的重要一步。

Theory of industrial organization is not a brand-new field, and we have many papers on several industries. However, there are not so many papers on Japan's non-life insurance industry by using standard econometrics. We aim to make up for the gap and to adopt an orthodox econometrics into the industry.Although we have both the historical studies and the cross-sectional analysis using by econometrics, there are no the cross-sectional and time-series approach to the non-life insurance industry in Japan. In this research, we collected the post-war data as long as we could, and investigated the data of individual insurance company. And then we tried to understand the whole picture of the post-war non-life insurance industry. How to get the picture in this research are that we make a database which we called 'panel data', and examine the industrial organization using both the traditional statistical analysis and the orthodox econometrics.This research show the followings.1. Some characteristics of the post-war non-life insurance industry are made clear by econometrics using panel data.2. We get interesting results that could use in examining the strategy of each insurance company.3. After completed this research, we are possible to compare life insurance and non-life insurance industry. Both industries have been under regulations and supervision by the Ministry of finance long time.By the way, now in Japan, we met the drastic changes in the non-life insurance industry. We are in the era of transformation in insurance system, and it is naturally that the characteristics would be changing. In the near future, after adding data, we would like to reexamine the changes in the industrial organization. Results in this research are an important step to such a study.