A bond portfolio is made up of $14 million in zero-coupon bonds maturing in 2 years, and $9 million in zero-coupon bonds maturing in 24 years. The yield curve is flat at 8%. What is the Macaulay duration of this bond portfolio? Please enter your answer in years rounded to two decimal places.
Duration of the portfolio measures the sensitivity of the portfolio when the interest rate changes
Macaulay Duration of the zero coupon bond is equal to years left to maturity.
Duration of $14 million zero coupon bond(A) = 2 years
Duration of $9 million zero coupon bond(B) = 24 years
Weight of A = $14 million/ ($14 million+$9 million) = 0.609
Weight of B = $9 million/ ($14 million+$9 million) = 0.391
Duration of portfolio = (Weight of A*Duratio of A) + (Weight ot B*Duration of B)
= (0.609*2)+(0.391*24)
= 1.218+9.384
= 10.608
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