本研究以免疫理論（Immunization Theory）與投資組合理論（Portfolio Theory）來架構退休基金的資產負債管理模型，希望在免除利率風險的情況下，極大化退休基金的投資報酬率。本文以退撫基金86年到88年實際投資的實證資料及其對未來給付支出的預測模擬值，在不同考慮年限與提撥率下，建議其最適投資組合，並計算出資產負債管理的成本。最後，再以84年到88年市場平均資料的實證結果，支持並驗證我們以退撫基金內部資料所做的實證結果。研究發現：
1、資產負債管理的成本相當少，因此退撫基金應該儘早進行資產負債管理。若以資產負債管理前後效率前緣下投資報酬率的差異為資產負債管理的成本，以退撫基金內部資料的研究顯示，資產負債管理的平均成本為0.133﹪；以市場平均資料的研究顯示，資產負債管理的平均成本為0.234﹪。
2、在進行資產負債管理的分析後，退撫基金的薪資提撥率應提高至14.84﹪，才能確保未來的30年內，退撫基金不會因為利率變動而導致基金破產甚至無力清償。
3、要使退撫基金免於利率風險的年限愈長，其投資重心必須從短期票券和債券移到債券與股票或受益憑證上。 / This paper investigates the Asset-Liability Management for pension fund. We utilize Immunization Theory and Portfolio Theory selection model to immunize the surplus of pension funds against interest-rate fluctuations and to maximize expected return of pension fund simultaneously. In addition, we use the public trading data of the investment market in Taiwan from 1995 to1999 and the data from the Taiwan Public Employees Retirement System（TPERS）from1997 to 1999 to demonstrate the implementation of our model. We calculate the optimal asset allocation and the ALM cost under different time horizons and contribution rates. The empirical results from this study show that:
1、 The ALM cost is very small. Therefore, we suggest TPERS should start to implement ALM as soon as possible. Given the investment performance of TPERS, We find the ALM cost is 0.133﹪. Given the performance of the investment market, the ALM cost is 0.234﹪.
2、 The TPERS must increase its contribution rate to 14.84﹪ in order to make sure that the TPERS will not be insolvent as a result of interest-rate fluctuations in 30 years.
3、 To prolong the period over which the TPERS can immunize its surplus against interest-rate fluctuations, a large proportion of the investment asset should be allocate from commercial paper and bond to bond and stock.
| Identifer | oai:union.ndltd.org:CHENGCHI/A2002001474 |
| Creators | 彭愛蘋 |
| Publisher | 國立政治大學 |
| Source Sets | National Chengchi University Libraries |
| Language | 中文 |
| Detected Language | English |
| Type | text |
| Rights | Copyright © nccu library on behalf of the copyright holders |
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