Immunization Strategies for Funding Multiple Liabilities
探讨投资者如何通过选择资产组合来免疫多笔未来固定负债，确保回报不低于购买时承诺的水平，对负债管理者和固定收益投资者有参考价值。
A number of recent papers have shown that it is possible for an investor to immunize a portfolio of default and option-free coupon bonds so that the return realized over a given planning period will never be less than that promised at the time the bonds were purchased. In this way, a future fixed dollar liability may be discharged with certainty by acquiring an asset portfolio with a market value equal to the present value of the liability and setting its appropriate duration equal to the time remaining to the date of discharge.1 However, most investors have more than one liability to discharge. In his seminal article in 1952, F. M. Redington showed that a stream of liabilities may be immunized if an asset portfolio having the same present value as the liabilities is selected so that: 1. its duration is equal to the duration of the liabilities; and