Stock. Call. Put. Bond. Option Fundamentals


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1 Option Fundamentals Payoff Diagrams hese are the basic building blocks of financial engineering. hey represent the payoffs or terminal values of various investment choices. We shall assume that the maturity value of the bond is $X, the exercise price. Long (Buy) Positions Short (Sell) Positions Stock +S S +C Call C +P Put P Bond +B B
2 Payoff Positions he algebra of the payoffs is shown in the table below. he exercise price of the options will be defined as $X and we shall assume that the maturity value of the bond is $X Stock Price S C P B S > X S S X nil X S < X S nil X S X Financial Alchemy What happens when we combine some of these investments Buy a Share and a Put (S+P) Buy a Bond and a Call (B+C) +S +P S+P +B +C B+C Notice that these have the same pattern of payoffs, given the change in the underlying stock price. he payoffs are: S + P B + C S > X S: S B: X P: 0 C: S X otal S otal S S < X S: S B: X P: X S C: 0 otal X otal X With options, it is possible to create a risk free payoff:
3 S > X S + P C S: S P: 0 C: (S X) otal X +S +P C S+PC S: S P: X S S < X C: 0 otal X Note that this creates a risk free payoff, which is always $X. herefore, we can create a riskfree security by buying a stock, buying a put option with an exercise price of $X and selling (or writing) a call option with an exercise price of $X. Binomial Pricing Let s assume that we have a stock currently selling for $40 and there is an atthemoney option that expires in 6 months, ½ a year. he risk free rate is 4.04% or % over the sixmonth time horizon. We shall assume that the outcomes are binary, that is that the stock can either rise 5% or fall 0%. Note that these two rates imply terminal values that are the multiplicative inverse of each other, (1+5%) 1/(10%). hus the terminal values for the stock can be either $3 or $50. We shall examine two strategies to allow us to work toward pricing the option. Strategy #1 Buy a Call P 6 40(10%) $3 P 6 40(1+5%) $50 Call Value nil $10 Strategy # Buy 5/9s of a share and take out a riskfree loan with a repayment of $ he loan is ($ )/(1.0) P 6 40(10%) $3 P 6 40(1+5%) $50 Stock Value $3 x (5/9) $ $50 x (5/9) $7.777 Loan Repayment ($ ) ($ ) otal nil $10 Notice that these two strategies have identical payoffs, meaning that the two strategies must have the same value: C (5/9)(40) $4.793
4 Where did the 5/9s come from? his is the Delta ( ) of the option. It is also known as the hedge ratio. Spread of Options Values Spread of Share Values Where did the $ come from? It is the difference between the inthemoney share payoff (5/9 x $ ) and the option payoff ($10.00). he amount borrowed is the present value, discounted at the riskfree rate of interest. Based on what we have seen with creating risk free payoffs, the option value that we obtained, $4.793, is a fair value. Any other price would create arbitrage opportunities. Risk Neutral Valuation Let s take another approach, and assume that investors do not care about risk. Since we demonstrated that we could create riskfree payoffs using options, this approach is not much of a stretch. Since investors are indifferent about risk, the return expected on the stock over the next six months is %. Let s compute the riskneutral probability that the stock will rise (P U ): () % ( PU )( 5% ) + ( 1 PU )( 0% ) % ( 5% )( PU ) + ( 0% )( PU ) ( 0% ) % ( 45% )( PU ) ( P ) ( % ) ( 45% ) E r U Let s apply this probability to the option payoff or terminal value: Probability erminal Value CrossProduct $ otal his is the expected value of the option at the maturity. he present value of this is $4.888 /1.0 $4.793, the same value that we had before. he general formula to get this riskneutral probability of an upside price movement is: 5 9
5 P U r D, where r is the risk free return to the maturity of the option. U D Put Option Valuation Strategy #1 Buy a Put P 6 40(10%) $3 P 6 40(1+5%) $50 Put Value 40 3 $8 nil Strategy # Sell 4/9s of a share and lend $1.786 as a riskfree loan with a repayment of $. P 6 40(10%) $3 P 6 40(1+5%) $50 Stock Value $3 x (4/9) ($14. ) $50 x (4/9) ($. ) Loan Repayment ($. ) ($. ) otal $8 Nil Notice that these two strategies have identical payoffs, meaning that the two strategies must have the same value: Using Risk Neutral Valuation: P (4/9)(40) $ Probability erminal Value CrossProduct $ otal his is the expected value of the option at the maturity. he present value of this is $ /1.0 $4.0087, which is the same value. PutCall Parity Recall that: In our example: S + P B + C and B Xe r S + P Xe r + C P C S + Xe r P $ (30.00) 0.0 $4.0087
6 General Form of PutCall Parity Generalizing Binomial Option Pricing C P S Xe r We assumed that there were only two terminal values of the stock in the future, S(1+U) and S(1+D). o make this more realistic, we split the time preiods into smaller fractions of the year and adjust the u (1 + U) and d (1 + D) movements accordingly. As an intermediate step the binomial lattice would look like this: Su 10 Su 9 Su 8 Sdu 9 Su 7 Sdu 8 Su 6 Sdu 7 Sd u 8 Su 5 Sdu 6 Sd u 7 Su 4 Sdu 5 Sd u 6 Sd 3 u 7 Su 3 Sdu 4 Sd u 5 Sd 3 u 6 Su Sdu 3 Sd u 4 Sd 3 u 5 Sd 4 u 6 Su Sdu Sd u 3 Sd 3 u 4 Sd 4 u 5 S Sud Sd u Sd 3 u 3 Sd 4 u 4 Sd 5 u 5 Sd Sd u Sd 3 u Sd 4 u 3 Sd 5 u 4 Sd Sd 3 u Sd 4 u Sd 5 u 3 Sd 6 u 4 Sd 3 Sd 4 u Sd 5 u Sd 6 u 3 Sd 4 Sd 5 u Sd 6 u Sd 7 u 3 Sd 5 Sd 6 u Sd 7 u Sd 6 Sd 7 u Sd 8 u Sd 7 Sd 8 u Sd 8 Sd 9 u Sd 9 Sd 10 As the time intervals or steps get smaller and the ending points become continuous, we have the familiar situations of the binomial approaching the normal. he difference here is that the probabilities are not symmetrical and the distribution of ending prices is actually the lognormal. o determine the appropriate values of U and D (or u and d) we need the following relationships: Applying this to our example: 1+ U u e 1+ D d 1/ u
7 1.5 e ( ) ln ( ) ln % his means that the values of u 5% and d 0% correspond to an annual standard deviation of 31.56%. In our example, if we wanted to create the a binomial lattice with six, onemonth steps, the values that we would use would be: 1+ U u e or BlackScholes Option Pricing Model C S N d r ( ) Xe N( ) 1 d ( ) D d 1/ u U % D % 1 1 d 1 S Xe S Xe r r + + S + rf + X d S Xe S Xe S + rf X d 1 r r Brealey and Myers Notation Standard extbook Notation
8 Applying the BlackScholes to the example: d d e Using the NORMSDIS Excel function: N(d 1 ) , N(d ) C 40(0.5797) 40e 0.0 (0.491) $3.98
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