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The Costs of Owning Employer Stocks: Lessons from Taiwan

Published online by Cambridge University Press:  06 April 2009

Yi-Tsung Lee
Affiliation:
[email protected], Department of Accounting, National Chengchi University, Taipei, Taiwan
Yu-Jane Liu
Affiliation:
[email protected], Guanghua School of Management, Peking University, Beijing, China and Department of Finance, National Chengchi University, Taipei, Taiwan
Ning Zhu
Affiliation:
[email protected], Department of Finance, University of California Davis, Davis, CA 95616 and Lehman Brothers.

Abstract

Using data on all employees at listed companies in Taiwan, we find that the bias toward employer stocks is generic to individual investor decision making, but not limited to retirement plans. Seventy-one percent of the sample employees invest in employer stocks and employer stocks make up on average 47% of employee equity portfolios. The underdiversification resulting from the bias toward employer stocks is very costly. Holding current portfolio risk constant, employees forego 4.89% per annum in raw returns by investing in employer stocks, which represents 39.74% of their average 1998 salary income. Our findings have important implications for social security reform and retirement account management.

Type
Research Article
Copyright
Copyright © School of Business Administration, University of Washington 2008

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