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Management of Interest-Rate Risk

Professor Lasse H. Pedersen

Prof. Lasse H. Pedersen

1

Outline
Interest rate sensitivity
Duration
Cash-flow matching
Duration matching: immunization
Convexity

Prof. Lasse H. Pedersen

2

Interest-Rate Sensitivity
First order effect: Bond prices and yields are negatively related
Maturity matters: Prices of long-term bonds are more sensitive to interest-rate changes than short-term bonds
Convexity: An increase in a bond’s YTM results in a smaller price decline than the price gain associated with a decrease of equal magnitude in the YTM.
Prof. Lasse H. Pedersen

3

Duration
The duration (D) of a bond with cashflows c(t) is defined as minus the elasticity of its price (P) with respect to 1 plus its yield (y): dP 1 + y T c(t )
D=−
= ∑ f (t ) t , where f (t ) = dy P
(1 + y ) t P
1
We see that the duration is equal to the average of the cash-flow times t weighted by f(t), the fraction of the present value of the bond that comes from c(t) !
The relative price-response to a yield change is therefore: ∆P
∆y
D modified P

≅ −D

1+ y

=−

1+ y
{

∆y = − D

∆y

modified duration Prof. Lasse H. Pedersen

4

Example: Duration of a Coupon
Bond
What is the duration of a 3-year coupon bond with a coupon rate of 8% and a YTM of 10% ?
If the YTM changes to 10.1%, what would be the (relative) change in price ?
If the YTM changes to 11%, what would be the
(relative) change in price ?

Prof. Lasse H. Pedersen

5

Duration Facts
The duration of a portfolio is the weighted average of the durations: D p = ∑ ω i Di i What is the duration of zero-coupon bond?
What must be true for the duration of a coupon bond?
What happens to the duration of a coupon bond if (all else equal) the coupon rate increases? The duration of a perpetuity is: (1+y)/y
Prof. Lasse H.

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