289 /342
289
臺大管理論叢
2017/5
第
27
卷第
2S
期
289-318
DOI:10.6226/NTUMR.2017.JAN.RM104-019
保險業集中度及效率對市場競爭程度的影響：以
日本產險業為例
The Impact of Concentration and Efficiency on Market
Competition: An Analysis of Japanese Non-Life Insurance Industry
摘 要
本文研究日本產險公司併購重組造成市場集中、公司經營效率改變，對市場競爭程度
的影響。以壟斷力指標
(Lerner Index)
衡量市場競爭程度，以赫芬達指數衡量市場集中
度、以資料包絡分析法所求出之效率值衡量為公司效率。結果發現，日本產險業市場
集中度及公司效率皆對競爭度有負向影響，且日本市場集中度與市場競爭度反向關係，
僅存在於市場壟斷力較大的子樣本。壟斷力高之廠商，專注主要險種之產品策略、優
於多角化策略。
【關鍵字】
市場競爭程度、市場壟斷力、集中度、效率、日本產險業
Abstract
This study assesses the impact of concentration and efficiency on competition in the
Japanese non-life insurance industry and use the fixed effect model to analyze data from
2001 to 2012. We use the Lerner index as a proxy for market power while measuring market
concentration by using the Herfindahl-Hirschman index. The data envelopment analysis
method is also used to evaluate the efficiency of insurance companies. We find that the
higher the concentration level or firm efficiency, the higher the Lerner index of the firm.
Further analysis shows that the positive relationship between concentration level and market
power exists only in firms with higher market power. The strategy of firms with high market
power tends to be specializing in main product lines such as auto lines, but diversification
can raise the market power within low-market-power firms.
【
Keywords
】
market competition level, market power, concentration, efficiency, Japanese
non-life insurance industry
鄭士卿
/
國立政治大學風險管理與保險學系副教授
Vivian Shih-Ching Jeng
, Associate Professor, Department of Risk Management and Insurance, National
Chengchi University
汪琪玲
/
淡江大學保險學系教授
Kili Chi-Ling Wang
, Professor, Department of Insurance, Tamkang University
蕭維萱
/
中國信託商業銀行個金風險政策部專員
Kahlen Wei-Hsian Hsiao
, Account Officer, Department of Consumer Finance, CTBC Bank
Received 2015/12, Final revision received 2017/1