nle 1618 Problem Set 6 classpdf I Prices and yields A 10year
Solution
1.
A.
Coupon rate does not change, because it is fixed w.r.t. the face value when the bond is issued.
B.
Price of the bond decreases, because yield increases. There is an inverse relationship between bond price and yield rate.
C.
Yield to maturity increases, because price of the bond decreases. There is an inverse relationship between the YTM and the bond price.
2.
A.
With rise in interest rate, bond price will fall.
For example,
Price of 2 year bond with face value of $1000 , coupon rate of 10% and interest rate of 8% is P1.
P1 = 100*(1-1/1.08^2)/.08 + 1000/1.08^2 = $1035.67
Price of 2 year bond with face value of $1000 , coupon rate of 10% and interest rate of 11% is P2.
P2 = 100*(1-1/1.11^2)/.11 + 1000/1.11^2 = $982.87
It can be seen that, with increase in interest rate, bond price is decreasing.
B.
If yield rate is greater than the coupon rate, then bond price will be less than $100.
For example,
Price of 2 year bond with face value of $100, coupon rate of 10% and interest rate of 11% is P. Here, yield rate is bigger than the coupon rate.
P = 10*(1-1/1.11^2)/.11 + 100/1.11^2 = $98.28
Now, it can be seen that price is lower than the $100.
C.
Yield is less than the coupon, when the price exceeds $100.
For example,
Price of 2 year bond with face value of $100 , coupon rate of 10% and interest rate of 8% is P.
P = 10*(1-1/1.08^2)/.08 + 100/1.08^2 = $103.56
Here, bond price is more than $100, when coupon rate is higher than yield.
D.
High coupon bonds sell at higher prices than the low coupon bonds.

