introduction to financial derivatives lecture #4 on option jinho bae may 8, 2008
TRANSCRIPT
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Introduction to Financial Derivatives
Lecture #4 on option
Jinho Bae
May 8, 2008
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Ch 8. Option pricing models
I. Value of an option– Intrinsic value – Time value
II. Factors that affect the price of an option
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I. Value of an option
• Value of an option =Option premium=Option price
• The price that an option holder pays to an option writer for the right to sell or buy an asset
• Value of an option= Intrinsic value + Time value
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• When the spot price (S) exceeds the strike price (X)
Intrinsic value=S-X>0
e.g) Google call option with X=$460
Google share price S=$465
Intrinsic value=S-X=$5
I-1-1. Intrinsic value of a call option
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Intrinsic value of a call option
• When the spot price (S) does not exceed the strike price (X)
Intrinsic value=0
e.g) Google call option with X=$460
Google share price S=$450
Intrinsic value=0
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• Mathematical expression of intrinsic value of a call option
max(S-X, 0)• When S>X, S-X>0 take S-X • When S<X, S-X<0 take 0
Intrinsic value of a call option
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valueIntrinsic value
X S
Intrinsic value of a call option
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I-1-2. Intrinsic value of a put option
• When the strike price (X) exceeds the spot price (S)
Intrinsic value=X-S>0
e.g) Google put option with X=$460
Google share price S=$450
Intrinsic value=X-S=$10
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Intrinsic value of a put option
• When the strike price (X) does not exceed the spot price (S)
Intrinsic value=0
e.g) Google call option with X=$460
Google share price S=$465
Intrinsic value=0
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Intrinsic value of a put option
• Mathematical expression of intrinsic value of a put option
max(X-S, 0)• When X>S, X-S>0 take X-S• When X<S, X-S<0 take 0
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Intrinsic value of a put option
value
Intrinsic value
X S
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Relationship between intrinsic value and ITM, OTM, ATM
S>X
Call ITM
Intrinsic value >0
Put OTM
Intrinsic value=0
S=X
ATM
Intrinsic value=0
ATM
Intrinsic value=0
S<X
OTM
Intrinsic value=0
ITM
Intrinsic value >0
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I-2. Time value of an option
• The value of an option arising from the time left to maturity
• Time value = Option premium - Intrinsic value
e.g) IBM call option with X=$100 trades at $10 IBM share price S=$106 Intrinsic value=S-X=$6 Time value= $10-$6=$4
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Two elements of time value of an option
1) Time value 1: Expected payoff when holding the option until maturity
2) Time value 2: Time value associated with cash flow from selling or buying underlying asset of the option
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1) Time value 1
Two scenarios of asset price movement until maturity
• Asset price moves in a favorable direction unlimited positive payoff
• Asset price moves in an unfavorable direction no or bounded loss
Expected payoff is positive.
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E.g) IBM call option, X= $100, maturity=1 month
① current S=$100 (ATM)
If ST (at maturity) > $100 Payoff: ST - $100
If ST (at maturity) < $100 No loss
Expected payoff from changes in the asset price until maturity > 0
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Possibilities of changes in the asset price until maturity
Price change Probability
20 increase 1/8
10 increase 2/8
0 2/8
10 decrease 2/8
20 decrease 1/8
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S STProbabil
ityPayoff Expected payoff
100
1/8
2/8
2/8
2/8
1/8
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② current S=$90 (OTM)
Intrinsic value=$0
If ST (at maturity) > $100 Payoff: ST - $100
If ST (at maturity) < $100 No loss
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S STProbabi
lityPayoff Expected
payoff
90
1/8
2/8
2/8
2/8
1/8
Expected payoff Greater than 0. However, smaller than that for ATM. Why?
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③ current S=$110 (ITM)
Intrinsic value =$10
If asset price increases above 110 Payoff increases proportionally
If asset price increases below 110, intrinsic value decreases but bounded from 10.
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S STProbabil
ityPayoff Expected
payoff
110
1/8
2/8
2/8
2/8
1/8
Expected payoff Greater than 0. However, smaller than that for ATM.
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Time value 1 of a call option
X SCurrent spot price
value
Time value 1
OTM ATM
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Time value 1 of a put option
X SCurrent spot price
value
Time value 1
ATM OTM