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发表于 2011-3-25 14:09 | 只看该作者

Reading 62: Option Markets and Contracts-LOS i 习题精选

option, center, exercise, div, class
Session 17: Derivative Investments: Options, Swaps, and Interest Rate and Credit Derivatives
Reading 62: Option Markets and Contracts

LOS i: Illustrate how put-call parity for options on forwards (or futures) is established.

 

 

At time = 0, for a put option at exercise price (X) on a newly issued forward contact at FT (the forward price at time = 0), a portfolio with equal value could be constructed from being long in:

A)
 the underlying asset, long a put at X, and short in a pure-discount risk-free bond that pays X – FT at option expiration.
B)
 a call at X and long in a pure-discount risk-free bond that pays X – FT at option expiration.
C)
 a risk-free pure-discount bond that pays FT – X at option expiration and long in a put at X.

 

Utilizing the basic put/call parity equation, we're looking for a portfolio that is equal to the portfolio mentioned in the stem (a put option). The put-call parity equation is c0 + (X – FT) / (1+R)T = p0. Since (X – FT) / (1+R) is actually just the present value of the bond at expiration, the relationship can be simplified to long call + long bond = put.

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2#
发表于 2011-3-25 14:09 | 只看该作者

Put-call parity for options on forward contracts at the initiation of the option where the forward price at that time (time=0) is FT, can best be expressed as:

A)
 c0 + X / (1 + R)T ? FT = p0.
B)
 c0 + (X ? FT) / (1 + R)T = p0.
C)
 c0 ? (X ? FT) / (1 + R)T = p0.

Put call parity for stocks (with discrete time discounting) is c0 + X / (1 + R)T ? S0 = p0. Noting that for the forward contract on an asset with no underlying cash flows, S0 = FT / (1 + R)T, and substituting, we get c0 + (X ? FT) / (1 + R)T = p0.

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3#
发表于 2011-3-25 14:10 | 只看该作者

Which of the following would have the same value at t = 0 as an at-the-money call option on a forward contract priced at FT (the forward price at time = 0)?

A)
 A put option, long the underlying asset, and short a risk-free bond that pays X-FT at option expiration.
B)
 A put option on the forward at exercise price (X).
C)
 A put option, long the underlying asset, and short a risk-free bond that matures at X at option expiration.

Put-call parity for options on forward contracts is c0 + (X – FT) / (1+R)T = p0. Since X = FT for an at-the-money option, the put and the call have the same value for an at-the-money option.

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4#
发表于 2011-3-25 14:10 | 只看该作者

Which of the following is a correct specification of put-call parity for options on futures?

A)
B)
C)

Begin with put-call parity for a stock, and substitute

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