Yoshihiro Asai

Credit Ratings in the Japanese Bond Market

Recently, credit ratings have been enhancing the influence on issuers as well as the national economy. This paper explains the historical development and several current features of the Japanese bond market, and discusses why credit ratings gained a significant role in the 1990s. We also present empirical research on credit ratings in the Japanese bond market, and discuss how foreign raters tend to assign lower credit ratings than Japanese ones, but that the relative ratings among raters end up being similar. Finally, we clarify the issues that remained to be solved before credit rating companies can be considered truly reliable.

Effect of Group Affiliation, Ownership Structures, and New Entries on Efficiency: Lessons from the Japanese Life Insurance Industry after Deregulation

Deregulation and the succeeding changes, such as forming group affiliation, demutualization, and new entry from foreign countries, are widespread and worldwide phenomenon in the life insurance industry. This study examines impacts of the deregulation and the succeeding changes on efficiency of the Japanese life insurance industry using a Stochastic Input Distance Frontier Approach, a new version of Stochastic Frontier Analysis (SFA), which is the first application to an insurance industry. The main results are as follows. First, a group affiliated life insurer is more efficient than the others. Second, an efficiency difference between mutual and stock life insurers has been getting larger since deregulation. Third, there is not much difference of efficiency between foreign insurers and domestic insurers. We also find that efficiency of life insurers has decreased on average after deregulation.