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Option Valuation
Chapter 21
Option Values
Intrinsic value - profit that could be made if the option was immediately exercised.
Call: stock price - exercise price Put: exercise price - stock price
Time value - the difference between the option price and the intrinsic value.
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Time Value of Options: Call
Option value
Value of Call Intrinsic Value
Time value
X Stock Price
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Factors Influencing Option Values: Calls
Factor Effect on value Stock price increases Exercise price decreases Volatility of stock price increases Time to expiration increases Interest rate increases Dividend Rate decreases
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Restrictions on Option Value: Call
Value cannot be negative
Value cannot exceed the stock value
Value of the call must be greater than the value of levered equity
C > S0 - ( X + D ) / ( 1 + Rf )T
C > S0 - PV ( X ) - PV ( D )
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