CHAPTER. 22. Options and Corporate Finance: Basic Concepts. 22.1 Options 22.2 Call Options 22.3 Put Options 22.4 Selling Options 22.5 Reading The Wall Street Journal 22.6 Combinations of Options 22.7 Valuing Options 22.8 An Option‑Pricing Formula 22.9 Stocks and Bonds as Options
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CHAPTER
22
Options and Corporate Finance: Basic Concepts
22.1 Options
22.2 Call Options
22.3 Put Options
22.4 Selling Options
22.5 Reading The Wall Street Journal
22.6 Combinations of Options
22.7 Valuing Options
22.8 An Option‑Pricing Formula
22.9 Stocks and Bonds as Options
22.10 CapitalStructure Policy and Options
22.11 Mergers and Options
22.12 Investment in Real Projects and Options
22.13 Summary and Conclusions
Many corporate securities are similar to the stock options that are traded on organized exchanges.
Almost every issue of corporate stocks and bonds has option features.
In addition, capital structure and capital budgeting decisions can be viewed in terms of options.
Option Premium
Intrinsic Value
Speculative Value
+
=
Call options gives the holder the right, but not the obligation, to buy a given quantity of some asset on or before some time in the future, at prices agreed upon today.
When exercising a call option, you “call in” the asset.
C= Max[ST –E, 0]
Where
ST is the value of the stock at expiry (time T)
E is the exercise price.
C is the value of the call option at expiry
Buy a call
60
40
Option payoffs ($)
20
80
120
20
40
60
100
50
Stock price ($)
–20
Exercise price = $50
–40
60
40
Option payoffs ($)
20
80
120
20
40
60
100
50
Stock price ($)
–20
Exercise price = $50
Sell a call
–40
60
40
Option payoffs ($)
20
80
120
20
40
60
100
Stock price ($)
–20
–40
Buy a call
10
50
–10
Exercise price = $50; option premium = $10
Sell a call
Put options gives the holder the right, but not the obligation, to sell a given quantity of an asset on or before some time in the future, at prices agreed upon today.
When exercising a put, you “put” the asset to someone.
P= Max[E – ST, 0]
60
50
40
Option payoffs ($)
20
Buy a put
0
80
0
20
40
60
100
50
Stock price ($)
–20
Exercise price = $50
–40
40
Option payoffs ($)
20
Sell a put
0
80
0
20
40
60
100
50
Stock price ($)
–20
Exercise price = $50
–40
–50
60
40
Option payoffs ($)
20
Sell a put
10
Stock price ($)
80
50
20
40
60
100
–10
Buy a put
–20
Exercise price = $50; option premium = $10
–40
The seller (or writer) of an option has an obligation.
The purchaser of an option has an option.
Buy a call
40
Option payoffs ($)
Buy a put
Sell a call
Sell a put
10
Stock price ($)
50
40
60
100
Buy a call
–10
Buy a put
Sell a put
Exercise price = $50; option premium = $10
Sell a call
–40
This option has a strike price of $135;
a recent price for the stock is $138.25
July is the expiration month
This makes a call option with this exercise price inthemoney by $3.25 = $138¼ – $135.
Puts with this exercise price are outofthemoney.
On this day, 2,365 call options with thisexercise price were traded.
The CALL option with a strike priceof $135 is trading for $4.75.
Since the option is on 100 shares of stock, buying this option would cost $475 plus commissions.
On this day, 2,431 put options with thisexercise price were traded.
The PUT option with a strike price of $135 is trading for $.8125.
Since the option is on 100 shares of stock, buying this option would cost $81.25 plus commissions.
Puts and calls can serve as the building blocks for more complex option contracts.
If you understand this, you can become a financial engineer, tailoring the riskreturn profile to meet your client’s needs.
Protective Put payoffs
Value at expiry
$50
Buy the stock
Buy a put with an exercise price of $50
$0
Value of stock at expiry
$50
Value at expiry
Buy the stock at $40
$40
Protective Put strategy has downside protection and upside potential
$0
$10
$40
$50
Buy a put with exercise price of $50 for $10
Value of stock at expiry
$40
$10
$30
Value at expiry
Buy the stock at $40
Covered Call strategy
$0
Value of stock at expiry
$40
$50
Sell a call with exercise price of $50 for $10
$40
–20
Buy a call with exercise price of $50 for $10
40
Option payoffs ($)
30
Stock price ($)
40
60
30
70
Buy a put with exercise price of $50 for $10
$50
A Long Straddle only makes money if the stock price moves $20 away from $50.
20
This Short Straddle only loses money if the stock price moves $20 away from $50.
Option payoffs ($)
Sell a put with exercise price of
$50 for $10
Stock price ($)
30
70
40
60
$50
–30
Sell a call with an
exercise price of $50 for $10
–40
E
Portfolio value today = c0 +
(1+ r)T
bond
Portfolio payoff
Call
Option payoffs ($)
25
Stock price ($)
25
Consider the payoffs from holding a portfolio consisting of a call with a strike price of $25 and a bond with a future value of $25.
Portfolio payoff
Portfolio value today = p0 + S0
Option payoffs ($)
25
Stock price ($)
25
Consider the payoffs from holding a portfolio consisting of a share of stock and a put with a $25 strike.
Portfolio value today
Portfolio value today = p0 + S0
E
= c0 +
Option payoffs ($)
Option payoffs ($)
(1+ r)T
25
25
Stock price ($)
Stock price ($)
25
25
Since these portfolios have identical payoffs, they must have the same value today: hence
PutCall Parity: c0 + E/(1+r)T = p0 + S0
The last section concerned itself with the value of an option at expiry.
This section considers the value of an option prior to the expiration date.
A much more interesting question.
Call Put
The value of a call option C0 must fall within
max (S0 – E, 0) <C0<S0.
The precise position will depend on these factors.
Market Value
Profit
ST
Call
Option payoffs ($)
25
Time value
Intrinsic value
ST
E
Outofthemoney
Inthemoney
loss
The value of a call option C0 must fall within max (S0 – E, 0) <C0<S0.
We will start with a binomial option pricing formula to build our intuition.
Then we will graduate to the normal approximation to the binomial for some realworld option valuation.
S1
$28.75 = $25×(1.15)
$21.25 = $25×(1 –.15)
Suppose a stock is worth $25 today and in one period will either be worth 15% more or 15% less. S0= $25 today and in one year S1is either $28.75 or $21.25. The riskfree rate is 5%. What is the value of an atthemoney call option?
S0
$25
S0
S1
C1
$28.75
$3.75
$25
$21.25
$0
Borrow the present value of $21.25 today and buy 1 share.
The net payoff for this levered equity portfolio in one period is either $7.50 or $0.
The levered equity portfolio has twice the option’s payoff so the portfolio is worth twice the call option value.
S0
S1
debt
portfolio
C1
( – ) =
– $21.25
$7.50
$28.75
=
$3.75
$25
– $21.25
$21.25
$0
=
$0
The value today of the levered equity portfolio is today’s value of one share less the present value of a $21.25 debt:
S0
S1
debt
portfolio
C1
( – ) =
– $21.25
$7.50
$28.75
=
$3.75
$25
– $21.25
$21.25
$0
=
$0
We can value the call option todayas half of the value of thelevered equity portfolio:
S0
S1
debt
portfolio
C1
( – ) =
– $21.25
$7.50
$28.75
=
$3.75
$25
– $21.25
$21.25
$0
=
$0
C0
$2.38
If the interest rate is 5%, the call is worth:
S0
S1
debt
portfolio
C1
( – ) =
– $21.25
$7.50
$28.75
=
$3.75
$25
– $21.25
$21.25
$0
=
$0
The most important lesson (so far) from the binomial option pricing model is:
the replicating portfolio intuition.
Many derivative securities can be valued by valuing portfolios of primitive securities when those portfolios have the same payoffs as the derivative securities.
Swing of call
D =
Swing of stock
The delta of a put option is negative.
Value of a call = Stock price ×Delta – Amount borrowed
$2.38 = $25 × ½ – Amount borrowed
Amount borrowed = $10.12
´
+

´
q
V
(
U
)
(
1
q
)
V
(
D
)
=
V
(
0
)
+
(
1
r
)
f
S(U), V(U)
We could value V(0) as the value of the replicating portfolio. An equivalent method is riskneutral valuation
q
S(0), V(0)
1 q
S(D), V(D)
S(U), V(U)
S(0) is the value of the underlying asset today.
q
q is the riskneutral probability of an “up” move.
S(0), V(0)
1 q
S(D), V(D)
S(U) and S(D) are the values of the asset in the next period following an up move and a down move, respectively.
V(U) and V(D) are the values of the asset in the next period following an up move and a down move, respectively.
S(U), V(U)
q
´
+

´
q
V
(
U
)
(
1
q
)
V
(
D
)
=
V
(
0
)
S(0), V(0)
+
(
1
r
)
f
1 q
S(D), V(D)
´
+

´
q
S
(
U
)
(
1
q
)
S
(
D
)
=
S
(
0
)
+
(
1
r
)
f
A minor bit of algebra yields:
=
´
$
28
.
75
$
25
(
1
.
15
)
$28.75,C(D)
q
$25,C(0)
=
´

$
21
.
25
$
25
(
1
.
15
)
1 q
$21.25,C(D)
Suppose a stock is worth $25 today and in one period will either be worth 15% more or 15% less. The riskfree rate is 5%. What is the value of an atthemoney call option?
The binomial tree would look like this:
+
´

(
1
r
)
S
(
0
)
S
(
D
)
f
=
q

S
(
U
)
S
(
D
)
´

(
1
.
05
)
$
25
$
21
.
25
$
5
=
=
=
q
2
3

$
28
.
75
$
21
.
25
$
7
.
50
The next step would be to compute the risk neutral probabilities
$28.75,C(D)
2/3
$25,C(0)
1/3
$21.25,C(D)
=

C
(
U
)
$
28
.
75
$
25
=

C
(
D
)
max[$
25
$
28
.
75
,
0
]
After that, find the value of the call in the up state and down state.
$28.75, $3.75
2/3
$25,C(0)
1/3
$21.25, $0
´
+

´
q
C
(
U
)
(
1
q
)
C
(
D
)
=
C
(
0
)
+
(
1
r
)
f
´
+
´
2
3
$
3
.
75
(
1
3
)
$
0
=
C
(
0
)
(
1
.
05
)
$28.75,$3.75
$
2
.
50
2/3
=
=
C
(
0
)
$
2
.
38
(
1
.
05
)
$25,C(0)
1/3
$21.25, $0
Finally, find the value of the call at time 0:
$25,$2.38
This riskneutral result is consistent with valuing the call using a replicating portfolio.

=
´

´
rT
C
S
N(
d
)
Ee
N(
d
)
0
1
2
2
σ
+
+
ln(
S
/
E
)
(
r
)
T
2
=
d
1
s
T
=

s
d
d
T
2
1
The BlackScholes Model is
Where
C0 = the value of a European option at time t = 0
r = the riskfree interest rate.
N(d) = Probability that a standardized, normally distributed, random variable will be less than or equal to d.
The BlackScholes Model allows us to value options in the real world just as we have done in the 2state world.
Find the value of a sixmonth call option on the Microsoft with an exercise price of $150
The current value of a share of Microsoft is $160
The interest rate available in the U.S. is r = 5%.
The option maturity is 6 months (half of a year).
The volatility of the underlying asset is 30% per annum.
Before we start, note that the intrinsicvalue of the option is $10—our answer must be at least that amount.
+
+
2
ln(
S
/
E
)
(
r
.
5
σ
)
T
=
d
1
s
T
+
+
2
ln(
160
/
150
)
(.
05
.
5
(
0
.
30
)
).
5
=
=
d
0
.
5282
1
0
.
30
.
5
=

s
=

=
d
d
T
0
.
52815
0
.
30
.
5
0
.
31602
2
1
Let’s try our hand at using the model. If you have a calculator handy, follow along.
First calculate d1 and d2
Then,

=
´

´
rT
C
S
N(
d
)
Ee
N(
d
)
0
1
2
=
d
0
.
5282
1
=
d
0
.
31602
2

´
=
´

´
.
05
.
5
C
$
160
0
.
7013
150
e
0
.
62401
0
=
C
$
20
.
92
0
N(d1) = N(0.52815) = 0.7013
N(d2) = N(0.31602) = 0.62401
Levered Equity is a Call Option.
The underlying asset comprise the assets of the firm.
The strike price is the payoff of the bond.
If at the maturity of their debt, the assets of the firm are greater in value than the debt, the shareholders have an inthemoney call, they will pay the bondholders and “call in” the assets of the firm.
If at the maturity of the debt the shareholders have an outofthemoney call, they will not pay the bondholders (i.e. the shareholders will declare bankruptcy) and let the call expire.
Levered Equity is a Put Option.
The underlying asset comprise the assets of the firm.
The strike price is the payoff of the bond.
If at the maturity of their debt, the assets of the firm are less in value than the debt, shareholders have an inthemoney put.
They will put the firm to the bondholders.
If at the maturity of the debt the shareholders have an outofthemoney put, they will not exercise the option (i.e. NOT declare bankruptcy) and let the put expire.
It all comes down to putcall parity.
E
c0 = S0 + p0 –
(1+ r)T
Value of a riskfree bond
Value of a call on the firm
Value of a put on the firm
Value of the firm
=
–
+
Stockholder’s position in terms of put options
Stockholder’s position in terms of call options
Recall some of the agency costs of debt: they can all be seen in terms of options.
For example, recall the incentive shareholders in a levered firm have to take large risks.
AssetsBVMVLiabilitiesBVMV
Cash$200$200LT bonds$300
Fixed Asset$400$0Equity$300
Total$600$200Total$600$200
What happens if the firm is liquidated today?
$200
$0
The bondholders get $200; the shareholders get nothing.
$100
NPV = –$200 +
(1.10)
The GambleProbabilityPayoff
Win Big10%$1,000
Lose Big90%$0
Cost of investment is $200 (all the firm’s cash)
Required return is 50%
Expected CF from the Gamble = $1000 × 0.10 + $0 = $100
NPV = –$133
PV of Bonds With the Gamble:
PV of Stocks With the Gamble:
$30
$70
$20 =
$47 =
(1.50)
(1.50)
The stocks are worth more with the high risk project because the call option that the shareholders of the levered firm hold is worth more when the volatility of the firm is increased.
$38
$42.55
Thecontingent value rights paidthe difference between $42.55 andGeneral Mills’ stock price in oneyear up to a maximum of $4.55.
Cash payment to newly issued shares
$4.55
$0
Value of General Mills in 1 year
Own a put
Strike $42.55
$42.55
$42.55
– $38.00
$4.55
$42.55
Sell a put
Strike $38
–$38
Cash payment to newly issued shares
$0
Value of General Mills in 1 year
$38
Value of General Mills in 1 year
Value of a share
Value of a share plus cash payment
$42.55
$4.55
$0
Value of General Mills in 1 year
$38
$42.55
Classic NPV calculations typically ignore the flexibility that realworld firms typically have.
The next chapter will take up this point.
E
c0–
= S0 + p0
(1+ r)T
1.Current price of underlying stock.
2. Dividend yield of the underlying stock.
3. Strike price specified in the option contract.
4. Riskfree interest rate over the life of the contract.
5. Time remaining until the option contract expires.
6. Price volatility of the underlying stock.