Interest Rate Risk [LO2] Bond J has a coupon rate of 3 percent. Bond K has a coupon rate of 9 percent Both bonds have 19 years to maturity, make semiannual payments, and have a YTM of 6 percent. If interest rates suddenly rise by 2 percent, what is the percentage price change of these bonds? What if rates suddenly fall by 2 percent instead? What does this problem tell you about the interest rate risk of lower-coupon bonds?
To determine: The percentage change in bond price
Introduction:
A bond refers to the debt securities issued by the governments or corporations for raising capital. The borrower does not return the face value until maturity. However, the investor receives the coupons every year until the date of maturity.
Bond price or bond value refers to the present value of the future cash inflows of the bond after discounting at the required rate of return.
Answer to Problem 20QP
The percentage change in bond price is as follows:
Yield to maturity | Bond J | Bond K |
4% | (22.16%) | (17.99%) |
8% | 30.97% | 24.20% |
The interest rate risk is high for a bond with lower coupon rate and low for a bond with high coupon rate.
Explanation of Solution
Given information:
There are two bonds namely Bond J and Bond K. Both the bonds mature after 19 years. The coupon rate of Bond J is 3 percent, and the coupon rate of Bond K is 9 percent. Both the bonds pay the coupon semiannually. The yield to maturity of the bonds is 6 percent.
Formulae:
The formula to calculate the bond value:
Where,
“C” refers to the coupon paid per period
“F” refers to the face value paid at maturity
“r” refers to the yield to maturity
“t” refers to the periods to maturity
The formula to calculate the percentage change in price:
Compute the bond value of Bond J at present:
The coupon rate of Bond J is 3 percent, and its face value is $1,000. Hence, the annual coupon payment is $30
The yield to maturity is 6 percent. As the calculations are semiannual, the yield to maturity should also be semiannual. Hence, the semiannual yield to maturity is 3 percent
The remaining time to maturity is 19 years. As the coupon payment is semiannual, the semiannual periods to maturity are 38
Hence, the bond price of Bond J is $662.6131 at present.
Compute the bond value of Bond K at present:
The coupon rate of Bond K is 9 percent, and its face value is $1,000. Hence, the annual coupon payment is $90
The yield to maturity is 6 percent. As the calculations are semiannual, the yield to maturity should also be semiannual. Hence, the semiannual yield to maturity is 3 percent
The remaining time to maturity is 19 years. As the coupon payment is semiannual, the semiannual periods to maturity are 38
Hence, the bond price of Bond K is $1,337.3869 at present.
The percentage change in the bond value of Bond J and Bond K when the interest rates rise by 2 percent:
Compute the new interest rate (yield to maturity) when the interest rates rise:
The interest rate refers to the yield to maturity of the bond. The initial yield to maturity of the bonds is 6 percent. If the interest rates rise by 2 percent, then the new interest rate or yield to maturity will be 8 percent
Compute the bond value when the yield to maturity of Bond J rises to 8 percent:
The coupon rate of Bond J is 3 percent, and its face value is $1,000. Hence, the annual coupon payment is $30
The yield to maturity is 8 percent. As the calculations are semiannual, the yield to maturity should also be semiannual. Hence, the semiannual yield to maturity is 4 percent
The remaining time to maturity is 19 years. As the coupon payment is semiannual, the semiannual periods to maturity are 38
Hence, the bond price of Bond J will be $515.8034 when the interest rises to 8 percent.
Compute the percentage change in the price of Bond J when the interest rates rise to 8 percent:
The new price after the increase in interest rate is $515.8034. The initial price of the bond was $662.6131.
Hence, the percentage decrease in the price of Bond J is (22.16 percent) when the interest rates rise to 8 percent.
Compute the bond value when the yield to maturity of Bond K rises to 8 percent:
The coupon rate of Bond K is 9 percent, and its face value is $1,000. Hence, the annual coupon payment is $90
The yield to maturity is 8 percent. As the calculations are semiannual, the yield to maturity should also be semiannual. Hence, the semiannual yield to maturity is 4 percent
The remaining time to maturity is 19 years. As the coupon payment is semiannual, the semiannual periods to maturity are 38
Hence, the bond price of Bond K will be $1,096.8393 when the interest rises to 8 percent.
Compute the percentage change in the price of Bond K when the interest rates rise to 8 percent:
The new price after the increase in interest rate is $1,096.8393. The initial price of the bond was $1,337.3869.
Hence, the percentage decrease in the price of Bond K is (17.99 percent) when the interest rates rise to 8 percent.
The percentage change in the bond value of Bond J and Bond K when the interest rates decline by 2 percent:
Compute the new interest rate (yield to maturity) when the interest rates decline:
The interest rate refers to the yield to maturity of the bond. The initial yield to maturity of the bonds is 6 percent. If the interest rates decline by 2 percent, then the new interest rate or yield to maturity will be 4 percent
Compute the bond value when the yield to maturity of Bond J declines to 4 percent:
The coupon rate of Bond J is 3 percent, and its face value is $1,000. Hence, the annual coupon payment is $30
The yield to maturity is 4 percent. As the calculations are semiannual, the yield to maturity should also be semiannual. Hence, the semiannual yield to maturity is 2 percent
The remaining time to maturity is 19 years. As the coupon payment is semiannual, the semiannual periods to maturity are 38
Hence, the bond price of Bond J will be $867.7968 when the interest declines to 4 percent.
Compute the percentage change in the price of Bond J when the interest rates decline to 4 percent:
The new price after the increase in interest rate is $867.7968. The initial price of the bond was $662.6131.
Hence, the percentage increase in the price of Bond J is 30.97 percent when the interest rates decline to 4 percent.
Compute the bond value when the yield to maturity of Bond K declines to 4 percent:
The coupon rate of Bond K is 9 percent, and its face value is $1,000. Hence, the annual coupon payment is $90
The yield to maturity is 4 percent. As the calculations are semiannual, the yield to maturity should also be semiannual. Hence, the semiannual yield to maturity is 2 percent
The remaining time to maturity is 19 years. As the coupon payment is semiannual, the semiannual periods to maturity are 38
Hence, the bond price of Bond K will be $1,661.0160 when the interest declines to 4 percent.
Compute the percentage change in the price of Bond K when the interest rates decline to 4 percent:
The new price after the increase in interest rate is $1,661.0160. The initial price of the bond was $1,337.3869.
Hence, the percentage increase in the price of Bond K is 24.20 percent when the interest rates decline to 4 percent.
A summary of the bond prices and yield to maturity of Bond J and Bond K:
Yield to maturity | Bond J | Bond K |
4% | $867.7968 | $1,661.0160 |
6% | $662.6131 | $1,337.3869 |
8% | $515.8034 | $1,096.8393 |
Table 1
The interest rate risk faced by lower coupon bonds:
The interest risk refers to the fluctuations in the bond value because of the interest rate changes. The bonds with lower coupons face a higher risk than the bonds with lower coupons.
In the above solution, the coupon rate of Bond J is 3 percent. It is lower than Bond K. As the coupon rate of Bond J is lower, the price fluctuations are higher. Bond J lost 22.16 percent when the interest rates increased and gained 30.97 percent when the interest rates declined.
On the contrary, the fluctuations in Bond K’s value were less when compared to Bond J because it had a coupon rate of 9 percent. Bond K lost only 17.99 percent when the interest rates increased and gained only 24.20 percent when the interest rates declined. The fluctuation was lower than Bond J.
Hence, the interest risk is high if the bond has a lower coupon rate.
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