Look again at Example 11.3. What would have been the immunizing weights in the second year if
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Look again at Example 11.3. What would have been the immunizing weights in the second year if the interest rate had fallen to 8%?
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EXAMPLE 11.3 Rebalancing Suppose that one year has passed, and the interest rate remains at 10%. The portfolio man- ager of Example 11.2 needs to reexamine her position. Is the position still fully funded? Is it still immunized? If not, what actions are required? First, examine funding. The present value of the obligation will have grown to $11,000, as it is one year closer to maturity. The manager's funds also have grown to $11,000: The zero- coupon bonds have increased in value from $5,000 to $5,500 with the passage of time, while the perpetuity has paid its annual $500 coupons and remains worth $5,000. Therefore, the obligation is still fully funded. The portfolio weights must be changed, however. The zero-coupon bond now will have a duration of two years, while the perpetuity duration remains at 11 years. The obligation is now due in six years. The weights must now satisfy the equation w x 2 + (1 - w) x 11 = 6 which implies that w = 5/9. To rebalance the portfolio and maintain the duration match, the manager now must invest a total of $11,000 × 5/9 = $6,111.11 in the zero-coupon bond. This requires that the entire $500 coupon payment be invested in the zero, with an additional $111.11 of the perpetuity sold and invested in the zero-coupon bond.
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Essentials Of Investments
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