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kickthatcfa

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11# 跳转到 »
发表于 2011-7-11 19:32 | 只看该作者
bought callable bond is equal to bought straight bond and sold call option (sold right to buy the straight bond).

the value of the straight bond goes down when rates go up. therefore the value of the call bond option decreases.

or

the probability that the issuer exercises the option (calls the bond) goes down when rates go up. when probability of exercise goes down the value of option goes down

ok?

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liquidity

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12#
发表于 2011-7-11 19:32 | 只看该作者
C=S+P-x/(1+r)

as r increases x decreases and C increases...

ok?

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ayodayo

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13#
发表于 2011-7-11 19:32 | 只看该作者
and what happens with S in the formula? (it changes with rate change too!)

pls see my second post in this thread, I was explaining rate change effect on parity (of bond option) there.



Edited 1 time(s). Last edit at Monday, May 3, 2010 at 02:54PM by pfcfaataf.

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Rasec

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14#
发表于 2011-7-11 19:32 | 只看该作者
Ok, so I found an "unofficial" answer to this:

For calls on Bonds the Delta drowns out the Rho effect - So pfcfaaf's reasoning is true.
The graph in the book is for equity securities, though it doesn't mention that in the book. In fact I don't remember reading anything on the differences b/w eq/bond options; does anyone have any reference to this in the CFAI texts? or would this not be tested? Iwould think that if there's a prectice Q like the one above it may be tested after all.


TenTen - BTW both answers are correct b/c for an equity call an increase in int rates would still increase the value of the equity call, however as was just posted with a rise in int rates the value of a call on a bond decreases.

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troymo

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15#
发表于 2011-7-11 19:32 | 只看该作者
So the answers conflict?!

Derivatives section tells us that as rates increase, rho causes the value of the call (and put) to increase slightly.

Fixed Income section tells us that as rates increase, the Value of the callable bond decreases and consequently, the value of the call on that bond decreases. As Schweser says in their answer:

Since the underlying asset to the option (the bond) decreases in value the option must decrease in value also. (Study Session 14, LOS 54.e, f)


Can someone please make sense of this conflict?

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bolligerallstar

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16#
发表于 2011-7-11 19:32 | 只看该作者
i dont have level 1 textbooks with me. what does it say about this?

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bdavi77962

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17#
发表于 2011-7-11 19:32 | 只看该作者
rus1bus Wrote:
-------------------------------------------------------
> Level 1 does not say anything about Value of
> Embedded Call Option changing with Interest Rates.
> And i think, establishing a relationship between
> them is not relevant either.
>
> It only talks about Value of Embedded Call Option
> changing with Interest Rate Volatility.

it is part of LEVEL 1

see Level 1 CFAI book 5 page 24
"
...when int rates decline ... the price of call option ...increases because the call option becomes more valuable to the issuer.

similarly, when int rates rise,... the price of embedded call option declines."

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sameeragarwal

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18#
发表于 2011-7-11 19:32 | 只看该作者
ataf, what you are quoting is value of free call option with interest rate changes. There is no argument on that, it will go down as interest rates go up.

What we are discussing is value of Embedded call option with interest rate changes.

Can you quote a relationship between value of Embedded call option with changes in Interest Rates in L1 text?

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luda002

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19#
发表于 2011-7-11 19:32 | 只看该作者
I figured it out!

Peter Frampton, CFA @ Analyst Forum

oh yeah, I feel like you do!

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tobeornottobe

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20#
发表于 2011-7-11 19:32 | 只看该作者
In the question, it is the embedded call that is referenced. The embedded call has an inverse relationship with rates.


Wall now turns his attention to the value of the embedded call option. How does the value of the embedded call option react to an increase in interest rates? The value of the embedded call:

A) decreases.

B) increases.

C) remains the same.


Your answer: A was correct!

Since the underlying asset to the option (the bond) decreases in value the option must decrease in value also. (Study Session 14, LOS 54.e, f)



Edited 1 time(s). Last edit at Tuesday, May 4, 2010 at 12:00PM by tenten.

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