2. Carter Bank makes a 3-year loan for $1,000 with an annual coupon rate of 8%.
a. Compute the annual coupon bond payment of a U.S. Treasury bond with a risk-free rate of 8%.
b. Suppose the spot rate for 3-year Treasury bonds increases to 9%, find the duration and use it to explain what happens to the present value of the bond in part a. SHOW YOUR WORK.
2. a.
Annual coupon payment = coupon rate x face value of the bond = 8% x 1,000 = $80
b.
When the spot rate is 9%,
Present value of the bond PV = PMT x [1 - (1 +y)-n ] / y + FV / (1 + y)n = 80 x (1 - 1.09-3) / 0.09 + 1000 / 1.093 = $974.69
When spot rate is 8%, PV- = 80 x (1 - 1.08-3) / 0.08 + 1000 / 1.083 = $1,000
When spot rate is 10%, PV+ = 80 x (1 - 1.1-3) / 0.1 + 1000 / 1.13 = 950.26
Duration of bond = (PV- - PV+) / (2 x PV x (y+ - y-)) = 49.74 / ( 2 x 974.69 x 0.02) = 1.26
This means that a 1% change in yields would inversely change the price of the bond by 1.26% (1% increase in rates will cause a 1.26% decrease in prices)
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