Present Value Yield to Maturity Simple loan Fixed payment loan ...
Economics 330
Menzie D. Chinn
Fall 2006
Social Sciences 7418
University of Wisconsin-Madison
Selected Notes on Interest Rates (9/11/06)
Present Value Let i = .10
In one year $100 X (1+ 0.10) = $110 In two years $110 X (1 + 0.10) = $121
or 100 X (1 + 0.10)2 In three years $121 X (1 + 0.10) = $133
or 100 X (1 + 0.10)3 In n years
$100 X (1 + i)n
PV = today's (present) value CF = future cash flow (payment)
i = the interest rate CF
PV = (1 + i)n
Yield to Maturity Simple loan
Fixed payment loan
PV = amount borrowed = $100
The same cash flow payment every period throughout
CF = cash flow in one year = $110
the life of the loan
n = number of years = 1
LV = loan value
$110 $100 = (1 + i)1
FP = fixed yearly payment n = number of years until maturity
(1 + i) $100 = $110 (1 + i) = $110 $100 i = 0.10 = 10%
LV =
FP 1+i
+ FP (1 + i)2
+
FP (1 + i)3
+
.
.
.
FP + (1 + i)n
For simple loans, the simple interest rate equals the
yield to maturity
Coupon bond
Consol
Using the same strategy used for the fixed-payment loan:
P = price of coupon bond
C = yearly coupon payment
F = face value of the bond
n = years to maturity date
P
=
C 1+i
+
C (1+i)2
+
C (1+i)3
+.
.
.
+
C (1+i)n
+
F (1+i)n
Pc = C / ic
Pc = price of the consol C = yearly interest payment ic = yield to maturity of the consol
Can rewrite above equation as ic = C / Pc
For coupon bonds, this equation gives current yield an easy-to-calculate approximation of yield to maturity
Discount bond
Rate of return
For any one year discount bond i= F-P P
F = Face value of the discount bond P = current price of the discount bond The yield to maturity equals the increase
The payments to the owner plus the change in value
expressed as a fraction of the purchase price
RET =
C
+
P t
+1
-
P t
Pt
Pt
RET = return from holding the bond from time t to time t + 1
Pt = price of bond at time t Pt+1 = price of the bond at time t + 1
in price over the year divided by the initial price. As with a coupon bond, the yield to maturity is
C = coupon payment
C Pt
= current yield = ic
negatively related to the current bond price.
Pt+1 - Pt = rate of capital gain = g P
t
................
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