Sensitivity of the Bond Price to the Interest Rate
Financial Economics
Duration
Sensitivity of the Bond Price to the Interest Rate
How sensitive is the price of a bond to the market interest rate? If the market interest rate rises, does the price fall much, or only slightly?
The sensitivity is greater for a long-term bond than for a short-term bond.
1
Financial Economics
Duration
One-Year Bond Versus Perpetual Bond
Consider a one-year bond with maturity value 1000 and coupon
payment 100. The bond price is the present value
1000 + 100 1+R
.
Also, consider a perpetual bond with coupon payment 100. The bond price is the present value
100 . R
The price of the perpetual bond is much more sensitive to the interest rate.
2
Financial Economics
Figure 1: Present Value and Interest
Duration
Present Value
12000 10000 8000 6000 4000 2000
0
Interest Rate
3
One-Year Bond Perpetual Bond
Financial Economics
Duration
Average Time-to-Payment
The owner of a bond receives coupon and principal payments, some sooner and some later. Duration is a measure of the average time-to-payment.
4
Financial Economics
Duration
Duration determines the sensitivity of the price of a bond to the market interest rate:
% change in bond price - duration ? % change in the interest rate (1)
holds approximately. For example, if the duration is five years, then a one per cent increase in the interest rate reduces the bond price by five per cent.
5
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