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Options, Futures, and Other Derivatives, 7th International
Edition, Copyright © John C. Hull 2019
11
Money Market Account continued
T
Since
g0
= 1 and
gT
=
e
rdt
Edition, Copyright © John C. Hull 2019
12
Zero-Coupon Bond Maturing at time T as Numeraire
The equation
f0 g0
E g
fT gT
becomes
f0 P (0,T )ET [ fT ]
w here P ( 0,T ) is the zero - coupon bond price
Options, Futures, and Other Derivatives, 7th International
Edition, Copyright © John C. Hull 2019
4
Extension of the Analysis to Several Underlying Variables
Martingales and Measures
Chapter 27
Options, Futures, and Other Derivatives, 7th International Edition,
Copyright © John C. Hull 2019
1
Derivatives Dependent on a Single Underlying Variable
Options, Futures, and Other Derivatives, 7th International
ቤተ መጻሕፍቲ ባይዱ
Edition, Copyright © John C. Hull 2019
15
Annuity Factor as the Numeraire
The equation
f0 g0
E g
The process for the value of the account is
dg=rg dt
This has zero volatility. Using the money market account as the numeraire leads to the traditional risk-neutral world where l=0
Options, Futures, and Other Derivatives, 7th International
Edition, Copyright © John C. Hull 2019
3
Market Price of Risk (Page 616)
Sincteheportfoilsioriskle:ss =rt
and E T denotes expectatio ns in a w orld that is FRN w rt the bond price
Options, Futures, and Other Derivatives, 7th International
Edition, Copyright © John C. Hull 2019
Options, Futures, and Other Derivatives, 7th International
Edition, Copyright © John C. Hull 2019
8
Forward Risk Neutrality
We will refer to a world where the market price of risk is the volatility of g as a world that is forward risk neutral with respect to g.
If Eg denotes a world that is FRN wrt g
f0 g0
E
g
f
T
gT
Options, Futures, and Other Derivatives, 7th International
Edition, Copyright © John C. Hull 2019
9
(t )dz i
dg
(t)
r
(t
)
m i 1
l
i
s
g
,i
(
t
)
g
(
t
)
dt
m i 1
s g ,i (t ) g (t )dz i
Options, Futures, and Other Derivatives, 7th International
Edition, Copyright © John C. Hull 2019
10
Money Market Account as the Numeraire
The money market account is an account that starts at $1 and is always invested at the shortterm risk-free interest rate
fT gT
becomes
f0
A
(0
)
E
A
A
fT (T
)
Options, Futures, and Other Derivatives, 7th International
Edition, Copyright © John C. Hull 2019
16
Annuity Factors and Swap Rates
Edition, Copyright © John C. Hull 2019
17
Extension to Several Independent Factors
(Page 625)
In the traditiona l risk - neutral world
m
df (t ) r (t ) f (t )dt s f ,i (t ) f (t )dz i i 1
d ?1 ƒ1
μ1
dt
σ1
dz
d?2 ƒ2
μ2
dt
σ2
dz
Options, Futures, and Other Derivatives, 7th International
Edition, Copyright © John C. Hull 2019
2
Forming a Riskless Portfolio
T higsive:sμ1σ2 μ2σ1 rσ2 rσ1
or μ1r μ2 r
σ1
σ2
This shows that (m – r )/s is the same for all derivatives dependent on the same underlying
variable,
We refer to (m – r )/s as the market price of risk for and denote it by l
Edition, Copyright © John C. Hull 2019
14
Interest Rates
In a world that is FRN wrt P(0,T2) the expected value of an interest rate lasting between times T1 and T2 is the forward interest rate
(Equations 27.12 and 27.13, page 619)
If f depends on several underlying
with
d?
ƒ
μ dt
n
σi
i 1
dz i
then
n
μ r λ iσ i i 1
variables
Options, Futures, and Other Derivatives, 7th International
We can set up a riskless portfolio , consisting of
+ σ 2 ƒ2 of the 1st derivative and σ1ƒ1 of the 2nd derivative
(σ 2 ƒ2 ) ƒ1 (σ 1ƒ1 ) ƒ2
= ( μ1σ 2 ƒ1ƒ2 μ 2 σ 1ƒ1ƒ2 ) t
0
,
the
equation
f0 g0
E g
fT gT
becomes
f0
Eˆ
e
T
rdt
0
fT
where Eˆ denotes expectatio ns in the
traditiona l risk - neutral world
Options, Futures, and Other Derivatives, 7th International
13
Forward Prices
In a world that is FRN wrt P(0,T), the expected value of a security at time T is its forward price
Options, Futures, and Other Derivatives, 7th International