il mapping e l’alm - unisi.it€¢ create a bull spread on ibm using the ... • twin-win...
TRANSCRIPT
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Lecture 2
From Plain Vanilla to Exotic Derivatives
Giampaolo Gabbi
Financial Engineering
MSc in Finance
2015 - 2016
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Outline
• Introduction and notations
• Option strategies
• Exotic Derivatives
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Note on Notation
• Here, T denotes time to expiry as well
as time of expiry, i.e. we use T to
denote indifferently T and δ = T – t
• Less accurate but handier this way, I
think
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Types of Strategies
• Take a position in the option and the
underlying
• Take a position in 2 or more options of the
same type (A spread)
• Combination: Take a position in a mixture of
calls & puts (A combination)
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Positions in an Option & the
Underlying
Profit
ST K
Profit
ST
K
Profit
ST
K
Profit
ST K
(a) (b)
(c) (d)
Basis of Put-Call Parity: P + S = C + Cash ( Ke-rT)
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Bull Spread Using Calls
K1 K2
Profit
ST
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Bull Spread Using Calls
Example
• Create a bull spread on IBM using the
following 3-month call options on IBM:
Option 1:
Strike: K1 = 102
Price: C1 = 5
Option 2:
Strike: K1 = 110
Price: C2 = 2
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Long Call (at K1)
plus
Short Call (at K2 > K1)
equals
Call Bull Spread
+1 0
+1
Profit
Share Price
K1
5
-3
K1=102
K2=110
SBE=105
0 0
-1
K2
+1
0
0 Gamble on stock price rise and offset cost
with sale of call
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Payoff:
Long call (K1) + short call (K2) = Bull Spread:
{ 0, +1, +1} + {0, 0, -1} = {0, +1, 0 }
= Max(0, ST-K1) – C1 – Max(0, ST-K2) + C2
= C2 - C1 if ST K1 K2
= ST - K1 + (C2 - C1) if K1 < ST K2
= (ST - K1 - C1) + (K2 - ST + C2) =
= K2 - K1 + (C2 - C1) if ST > K1 > K2
‘Break-even’:
SBE = K1 + (C1 – C2) = 102 + 3 = 105
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Bear Spread Using Puts
K1 K2
Profit
ST
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Bull Spreads with puts
& Bear Spreads with Calls
• Of course can do bull spreads with puts and
bear spreads with calls (put-call parity)
• Figured out how?
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Bull Spread Using Puts
K1 K2
Profit
ST
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Bear Spread Using Calls
K1 K2
Profit
ST
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You already hold stocks but you want to limit
downside (buy a put) but you are also willing to
limit the upside if you can earn some cash today
(by selling an option, i.e. a call)
COLLAR = long stock + long put (K1) + short call (K2)
{0,+1,0} = {+1,+1,+1} + {-1,0,0} + {0,0,-1}
Equity Collar
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+1 +1
+1
-1 0 0
Long Stock
Long Put
Short Call 0 0
-1
0
0
+1 Equity Collar
plus
plus
equals
Equity Collar: Payoff Profile
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ST < K1 K1 ST K2 ST > K2
Long Shares ST ST ST
Long Put (K1) K1 – ST 0 0
Short Call (K2) 0 0 – (ST – K2)
Gross Payoff K1 ST K2
Net Profit K1 – (P – C) ST – (P – C) K2 – (P – C)
Net Profit = Gross Payoff – (P – C)
Equity Collar Payoffs
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Short Put
plus
Long Call
equals
Long Futures
+1
+1
0
0 +1
+1
A Basic Combination: A
Synthetic Forward/Futures
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Range Forward Contracts
• Have the effect of ensuring that the exchange rate
paid or received will lie within a certain range
• When currency is to be paid it involves selling a put
with strike K1 and buying a call with strike K2 (with
K2 > K1)
• When currency is to be received it involves buying a
put with strike K1 and selling a call with strike K2
• Normally the price of the put equals the price of the
call
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Range Forward Contract
Payoff
Asset
Price
K1 K2
Payoff
Asset
Price
K1 K2
Short
Position
Long
Position
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Volatility Combinations
• Mainly
– Straddle
– Strangles
– These are strategies that show the true
‘character’ of options
• But also
– Strip
– Straps
– Etc.
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A Straddle Combination
Profit
ST K
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Long (buy) Straddle
Data:
K = 102 P = 3 C = 5 C + P = 8
profit long straddle: = Max (0, ST – K) - C + Max (0, K – ST) – P = 0
for ST > K
=> ST - K – (C + P) = K + (C + P) = 102 + 8 = 110
for ST < K
=> K - ST – (C + P) = K - (C + P) = 102 - 8 = 94
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Straddles and HF
• Fung and Hsieh (RFS, 2001) empirically
show that many hedge funds follow
strategies that resemble straddles:
• ‘Market timers’ returns are highly correlated
with the return to long straddles on
diversified equity indices and other basic
asset classes
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From Straddle Strategies
to Twin Win Certificates
An example • Twin-Win certificates are a special variant of the bonus certificate that
generate a positive return on their investment in bullish as well as bearish markets, as long as the underlying asset price doesn't decrease by too much and breaches through a predetermined barrier.
• Usually, the product has 100% participation to the upside (not capped) and 100% participation to the downside in absolute terms. In other words, should the underlying asset rise by 25%, the return on investment is +25%, and should the underlying asset fall by 25%, the return on investment is also +25%, as long as the barrier (which could for example be set at 40% below spot) wasn’t breached during its lifetime. If the barrier is breached (usually anytime during the lifetime of the product, i.e. American style barrier), the Twin-Win transforms itself in a certificate tracking the underlying asset. Any downside absolute participation disappears (the barrier has been “knocked-out”). The maturity of the product plays an important role, as the delta of the product amounts to approx. 95% at the product's inception. Hence, the positive performance that should be reflected in the mark-to-market price of the product in a bearish market only “grips” when around 70% of the time to maturity has expired.
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Payoff Features
The structure is constructed by means of a long
zero strike call, and long two down & out puts,
where the strike is set at-the-money.
The barrier level of the puts determines both the
maximum downside performance (in absolute
terms) the product could reach and the level at
which the product "knocks out" and loses the
downside absolute participation.
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Payoff Features
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Do’s • Use this product when you're not sure about where the market is
headed, but you think that it won’t crash by more than the barrier level. You must still consider the worst-case scenario (a crash through the barrier) and be able to bear the loss in case it happens
• Carefully consider the downside participation up to the barrier, and pitch it against the potential bonus of a classical bonus certificate: which is more attractive? Ask the structurer for variants.
• Limit the maturity to 12 – 24 Months
• Use a “worst-of” feature on underlying assets if their correlation is low and you believe that none of them will breach the barrier. Use 2, max 3 underlying assets, never 4, 5 or even more.
• Use a barrier level that gives a reasonable payoff in case the underlying effectively drops. If the barrier is too near the spot for your liking, use a cap on the upside to lower the barrier further.
• If a 20% decrease seems possible, take a barrier that will protect the investment up to a decrease of 35%. Better be safe than sorry.
• A Twin-win certificate on stock indices is especially well suited if you think that dividends will decrease in the future
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Don’ts • Don’t use this structure when you’re either strongly bullish or strongly
bearish. Other structures are better suited for such scenarios.
• Don’t invest into Twin-Win Certificates with maturities exceeding 2 or 3 years. Forecasting that an underlying will end up between zero and – X% (X% being the level of the barrier) in years from the moment ysou invest is practically impossible. The value of the protection therefore diminishes with the time to maturity
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Impact Factors • Dividend Yield (for Equity): the higher, the better. A Twin-Win cannot be
achieved on stocks paying no dividends. Of course, the dividends are not paid out to the Twin-Win Certificate's holder, as they are used to buy the two down & out puts.
• Yield (for Excess Return Indices): the higher the better.
• Volatility: the higher the better. Fact is that the mathematical models assume that the higher the volatility, the more likely it is that a barrier of the down & out put will be breached. Therefore, all other things remaining equal, the put options' value is considered lower the higher the volatility. In other words, a higher volatility allows to increase the protection puffer of the barrier (lower barrier level).
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Classical Variants • Worst-of Twin – Win: two or more underlying assets form the underlying
assets of the product. If one (the worst-of) hits the barrier, the downside participation is lost and the payoff is linked to the worst-of performin asset. The value extracted from the correlation is used primarily to shorten the maturity or to lower the barrier.
• Capped Twin – Win (represented on the right): the upside participation is capped at a certain level. The extracted value from the cap is used primarily to shorten the maturity or lower the barrier.
• Lock-in Twin – Win: as soon as a certain upside is realized, the whole structure becomes capital guaranteed. Interesting but expensive feature, and can usually only be realized with longer maturities. Could be used in combination with Worst-of
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Classical Variants. Twin Win
capped
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A Strangle Combination
K1 K2
Profit
ST
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K ST K ST
Strip Strap
Strip & Strap
Profit Profit
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Calendar (or horizontal) spreads
• Calendar (or horizontal) spreads
• Options, same strike price (K) but different
maturity dates, e.g. buying a long dated option
(360-day) and selling a short dated option (180-
day), both are at-the money
• In a relatively static market (i.e. S0 = K) this
spread will make money from time decay, but will
loose money if the stock price moves substantially
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Calendar (or horizontal) spreads
• Calendar spreads can be done with calls or puts and, if using
the same strikes, put and call calendar spreads are virtually
equivalent. Implementing the strategy involves buying one
option and selling another option of the same type and
strike, but with different expiration.
• A long calendar spread would entail buying an option (not a
"front month" contract) and selling a nearer-expiration
option of the same strike and type. Long calendar spreads
are traded for a debit, meaning you pay to open the overall
position.
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Calendar (or horizontal) spreads
• This strategy profits in a limited range
around the strike used. The trade can be set
up with a bullish, bearish or neutral bias.
The greatest profit will come when the
underlying is at the strike used at expiration.
• Calendar spreads also profit from a rise in
implied volatility, since the long option has a
higher Vega than the short option.
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Calendar (or horizontal) spreads
• Calendar spreads lose if the underlying moves too far in either direction. The maximum loss is the debit paid, up until the option you sold expires. After that, you are long an option and your further risk is the entire value of that option.
• Options in nearer-month expirations have more time decay than later months (they have a higher theta).
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Calendar (or horizontal) spreads
• The calendar spread profits from this difference in decay
rates
• This trade is best used when implied volatility is low and
when there is implied volatility "skew" between the months
used, specifically when the near-month sold has a higher
implied volatility than the later-month bought
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Calendar Spread Using Calls
ST
K
Profit
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Calendar Spread Using Puts
ST
K
Profit
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Calendar (or horizontal) spreads
• Example:
with the stock at 135.13 euros, the
September 135 call is purchased for
€15.45, and the July 135 call is sold for
€10.45, for a net debit of €5, which is the
maximum risk.
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Calendar (or horizontal) spreads
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Calendar (or horizontal) spreads
• This is a neutral trade used when the outlook is
for a range-bound underlying. The maximum
risk is known from the outset of the trade, and is
equal to the debit paid (until the first expiration).
• If the implied volatility does not change, the
position profits from roughly 121 to 154. Rises in
implied volatility will increase the profit and the
range.
• Time decay is on your side with this trade.
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Calendar (or horizontal) spreads Example of a Winning Trade RIMM (Research In Motion) moved up to 108 in late February, while
implied volatility moved down below 50.
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Calendar (or horizontal) spreads
• With the stock at 108, we would buy the April 110 calls for 7.50 and sell the March 110 calls for 4.45, for a net debit of 3.05.
• The maximum risk is the 305 we paid (remembering that options contacts come in lots of 100). The risk would be realized if the stock moves "too far" in either direction.
• In this case, RIMM was at 101 at March expiration, with implied volatility up to 65. So the March 110 call expired worthless, while the April 110 call was worth 4.30, for a 41% return.
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Calendar (or horizontal) spreads
Example of a Losing Trade
• Using the same charts, we see that establishing a spread just before
earnings would not have worked out.
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Calendar (or horizontal) spreads
• In August, we saw the price heading up through 220 and implied volatility at 62 percent. The October 220 call was purchased for 22.60 and the September 220 call sold for 15.90, for a net debit of 6.70.
• After earnings, the price plummeted down into the 80 range and implied volatility dropped below 50.
• The implied volatility recovered by the September and October expirations, but the price did not, so the maximum loss of 670 was realized.
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‘Quasi-Elementary’ Securities
• Arrow(-Debrew) introduces so called Arrow-
Debrew elementary securities,
i.e. contingent claims with $1 payoff in one state
and $0 in all other states
• These can be seen as “bet” options
• Butterflies look a lot like them
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Butterfly Spread Using Calls
K1 K3 ST K2
Profit
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Butterfly Spread Using Puts
K1 K3
Profit
ST K2
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Butterflies Replication
• Butterfly requires:
– sale of 2 ‘inner-strike price’ call options (K2)
– purchase of 2 'outer-strike price’ call options (K1, K3)
• Butterfly is a ‘bet’ on a small change in price of the underlying in either direction
• Potential downside of the ‘bet’ is offset by ‘truncating’ the payoff by buying some options
• Could also buy (go long) a bull and a bear (call or put) spread, same result
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Short Butterflies Replication
• Short butterfly requires:
– purchase of 2 ‘inner-strike price’ call options (K2)
– sale of 2 'outer-strike price’ call options (K1, K3)
• Short butterfly is a ‘bet’ on a large change in price of the underlying in either direction (e.g. result of reference to the competition authorities)
• Cost of the ‘bet’ is offset by ‘truncating’ the payoff by selling some options
• Could also sell (go short) a bull and a bear (call or put) spread, same result
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Short Butterfly Spread Using Calls
K1 K3
Profit
ST K2
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Butterfly example
• Suppose XYZ stock is trading at €40 in June. An options trader executes a long call butterfly by purchasing a JUL 30 call for €1100, writing two JUL 40 calls for €400 each and purchasing another JUL 50 call for €100. The net debit taken to enter the position is €400, which is also his maximum possible loss.
• Questions
• 1. What is the trader’s profit/loss if the XYZ stock at the expiry trades at 40?
• 2. What is the trader’s profit/loss if the XYZ stock at the expiry trades below 30 or above 50?
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55
Condor spread
• The condor option strategy is a limited risk,
non-directional option trading strategy that is
structured to earn a limited profit when the
underlying security is perceived to have little
volatility.
– Sell 1 ITM Call
Buy 1 ITM Call (Lower Strike)
Sell 1 OTM Call
Buy 1 OTM Call (Higher Strike)
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Condor spread example
• Suppose XYZ stock is trading at €45 in June. An options trader enters a condor trade by buying a JUL 35 call for €1100, writing a JUL 40 call for €700, writing another JUL 50 call for €200 and buying another JUL 55 call for €100. The net debit required to enter the trade is €300, which is also his maximum possible loss.
• What is the trader’s profit/loss if the XYZ stock at the expiry trades at 35?
• What is the trader’s profit/loss if the XYZ stock at the expiry trades at 55?
• What is the trader’s profit/loss if the XYZ stock at the expiry trades at 45?
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Condor spread con put
(Iron condor)
• The iron condor is a limited risk, non-directional option trading strategy that is designed to have a large probability of earning a small limited profit when the underlying security is perceived to have low volatility. The iron condor strategy can also be visualized as a combination of a bull put spread and a bear call spread.
– Sell 1 OTM Put Buy 1 OTM Put (Lower Strike) Sell 1 OTM Call Buy 1 OTM Call (Higher Strike)
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58
Condor spread con put
(Iron condor)
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59
Condor spread con put
(Iron condor)
• The iron condor is a limited risk, non-directional option trading strategy that is designed to have a large probability of earning a small limited profit when the underlying security is perceived to have low volatility. The iron condor strategy can also be visualized as a combination of a bull put spread and a bear call spread.
– Sell 1 OTM Put Buy 1 OTM Put (Lower Strike) Sell 1 OTM Call Buy 1 OTM Call (Higher Strike)
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Ladder
• The long call ladder, or bull call ladder, is a limited profit, unlimited risk strategy in options trading that is employed when the options trader thinks that the underlying security will experience little volatility in the near term.
• To setup the long call ladder, the options trader purchases an in-the-money call, sells an at-the-money call and sells another higher strike out-of-the-money call of the same underlying security and expiration date.
– Buy 1 ITM Call
– Sell 1 ATM Call
– Sell 1 OTM Call
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Ladder example
• Suppose XYZ stock is trading at €35 in June. An options trader executes a long call ladder strategy by buying a JUL 30 call for €600, selling a JUL 35 call for €200 and a JUL 40 call for €100. The net debit required for entering this trade is €300.
• What is the trader’s profit/loss if the XYZ stock at the expiry trades at 35?
• What is the trader’s profit/loss if the XYZ stock at the expiry trades at 50?
• What is the trader’s profit/loss if the XYZ stock at the expiry trades at 30?
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What’s the strategy?
Sell 1 ITM Put
Buy 1 ATM Put
Buy 1 OTM Put
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63
What’s the strategy?
• Suppose XYZ stock is trading at €40 in June. An options trader executes a short put ladder strategy by selling a JUL 45 put for €600, buying a JUL 40 put for €200 and a JUL 35 put for €100. The net credit received for entering this trade is €300.
• What is the trader’s profit/loss if the XYZ stock at the expiry trades at 40?
• What is the trader’s profit/loss if the XYZ stock at the expiry trades at 45?
• What is the trader’s profit/loss if the XYZ stock at the expiry trades at 25?
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Interest Rate Options
• Interest rate options give holder the right
but not the obligation to receive one
interest rate (e.g. floating\LIBOR) and pay
another (e.g. the fixed strike rate LK)
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Caps
• A cap is a portfolio of “caplets”
• Each caplet is a call option on a future LIBOR
rate with the payoff occurring in arrears
• Payoff at time tk+1 on each caplet is Ndk max(Lk -
LK, 0) where N is the notional amount, dk = tk+1 -
tk , LK is the cap rate, and Lk is the rate at time tk
for the period between tk and tk+1
• It has the effect of guaranteeing that the interest
rate in each of a number of future periods will
not rise above a certain level
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Caplet Payoff
t0 = 0 t1 = 30 t2 = 120 days
Expiry \ Valuation
of option, (LIBOR1 - LK)
Strike rate LK
fixed in
the contract
δ = 90 days
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Planned Borrowing + Caplet (Call on
Bond)
4
6
8
10
12
14
16
18
5 7 9 11 13 15
LIBOR at expiry
An
nu
alise
d C
ost
of
Bo
rro
win
g
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Loan + Interest Rate Floorlet (Put
on Bond)
0
5
10
15
20
4 6 8 10 12 14 16
LIBOR at expiry
An
nu
alize
d r
etu
rn
on
loan
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Funding cost
iT K
Return rate
iT
K
iT
K
(c)
(a) (b)
Return rate
Long
caplet
Short
caplet
Long
floorlet
iT
K
(d)
Funding cost
Short
floorlet
Positions in an Option & the Underlying
(notice variables on vertical axis)
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Collar Comprises a long cap and short floor.
It establishes both a floor and a ceiling on a corporate or bank’s
(floating rate) borrowing costs.
Effective Borrowing Cost with Collar (at T tk+1 = tk + 90) =
= [Lk – max[{0, Lk – LK} + max {0, LK – Lk}]N(90/360)
= Lk,CAP N(90/360) if Lk > Lk,CAP
= Lk,FL N(90/360) if Lk < Lk,FL
= Lk (90/360) if Lk,FL < Lk < Lk,CAP
Collar involves borrowing cost at each payment date of either Lk,CAP =
10% or Lk,FL = 8% or Lk = LIBOR if the latter is between 8% and 10%.
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Combining options with swaps
• Cancelable swaps - can be
cancelled by the firm entering
into the swap if interest rates
move a certain way
• Swaptions - options to enter
into a swap
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Swaptions
• OTC option for the buyer to enter into a swap at a future date and a predetermined swap rate
A payer swaption gives the buyer the right to enter into a swap where they pay the fixed leg and receive the floating leg (long IRS).
A receiver swaption gives the buyer the right to enter into a swap where they will receive the fixed leg, and pay the floating leg (short IRS).
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Swaptions Example
• A US bank has made a commitment to lend at fixed rate $10m over 3 years beginning in 2 years time and may need to fund this loan at a floating rate.
• In 2 years time, the bank may wish to swap the floating rate payments for a fixed rate, – Perhaps at that time, the bank may think that interest
rates may rise over the 3 years and hence the cost of the fixed rate payments in the swap will be higher than at inception.
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Example
• Bank might need a $10m swap, to pay fixed and receive floating beginning in 2 years time and an agreement that swap will last for further 3 years
• The bank can hedge by purchasing a 2-year European payer swaption, with expiry in T = 2, on a 3 year “pay fixed-receive floating” swap, at say sK = 10%.
• Payoff is the annuity value of Nδmax{sT – sK, 0}. So, value of swaption at T is:
• f = $10m[sT – sK] [(1 + L2,3)-1 + (1 + L2,4)
-2 + (1 + L2,5)-3]
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75
Exotics
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Types of Exotics
• Package
• Nonstandard
American options
• Forward start options
• Compound options
• Chooser options
• Barrier options
• Binary options
• Lookback options
• Shout options
• Asian options
• Options to exchange
one asset for another
• Options involving
several assets
• Volatility and Variance
swaps
• etc., etc., etc.
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Packages
• Portfolios of standard options
• Classical spreads and combinations:
bull spreads, bear spreads, straddles,
etc
• Often structured to have zero cost
• One popular package is a range
forward contract
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78
Non-Standard American Options
• Exercisable only on specific dates
(Bermudans)
• Early exercise allowed during only
part of life (initial “lock out” period)
• Strike price changes over the life
(warrants, convertibles)
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Forward Start Options
• Option starts at a future time, T1
• Implicit in employee stock option plans
• Often structured so that strike price
equals asset price at time T1
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Compound Option
• Option to buy or sell an option
– Call on call
– Put on call
– Call on put
– Put on put
• Can be valued analytically
• Price is quite low compared with a
regular option
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Chooser Option “As You Like It”
• Option starts at time 0, matures at T2
• At T1 (0 < T1 < T2) buyer chooses
whether it is a put or call
• This is a package!
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82
Chooser Option as a Package
))((
12
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1))(()(
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1212
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),0max(),max(
),max(
TTqr
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Ke
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SKeecpc
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strike with
timeat maturingput a plus timeat maturing call a is This
therefore is timeat valueThe
parity call-put From
is valuethe timeAt
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83
Barrier Options
• Option comes into existence only if stock
price hits barrier before option maturity
– ‘In’ options
• Option dies if stock price hits barrier
before option maturity
– ‘Out’ options
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84
Barrier Options (continued)
• Stock price must hit barrier from below
– ‘Up’ options
• Stock price must hit barrier from above
– ‘Down’ options
• Option may be a put or a call
• Eight possible combinations
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Parity Relations
c = cui + cuo
c = cdi + cdo
p = pui + puo
p = pdi + pdo
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86
Binary Options
• Cash-or-nothing: pays Q if ST > K,
otherwise pays nothing.
Value according to B&S = e–rT Q N(d2)
• Asset-or-nothing: pays ST if ST > K,
otherwise pays nothing.
Value according to B&S = S0e-qT N(d1)
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Decomposition of a Call Option
Long Asset-or-Nothing option
Short Cash-or-Nothing option where payoff
is K
Value according to B&S = S0e-qT N(d1) – e–rT
KN(d2)
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Asian Options
• Payoff related to average stock price
• Average Price options pay:
– Call: max(Save – K, 0)
– Put: max(K – Save , 0)
• Average Strike options pay:
– Call: max(ST – Save , 0)
– Put: max(Save – ST , 0)
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Asian Options
• No exact analytic valuation
• Can be approximately valued by assuming
that the average stock price is lognormally
distributed
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Lookback Options
• Floating lookback call pays ST – Smin at time T
(Allows buyer to buy stock at lowest observed
price in some interval of time)
• Floating lookback put pays Smax– ST at time T
(Allows buyer to sell stock at highest observed
price in some interval of time)
• Fixed lookback call pays max(Smax−K, 0)
• Fixed lookback put pays max(K −Smin, 0)
• Analytic valuation for all types
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Shout Options
• Buyer can ‘shout’ once during option life
• Final payoff is either
– Usual option payoff, max(ST – K, 0), or
– Intrinsic value at time of shout, St – K
• Payoff: max(ST – St , 0) + St – K
• Similar to lookback option but cheaper
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Exchange Options
• Option to exchange one asset for
another
• For example, an option to exchange
one unit of U for one unit of V
• Payoff is max(VT – UT, 0)
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Basket Options
• A basket option is an option to buy or sell
a portfolio of assets
• This can be valued by calculating the first
two moments of the value of the basket
and then assuming it is lognormal
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Volatility and Variance Swaps
• Agreement to exchange the realized volatility
between time 0 and time T for a pre-specified
fixed volatility with both being multiplied by a
pre-specified principal
• Variance swap is agreement to exchange the
realized variance rate between time 0 and time
T for a pre-specified fixed variance rate with both
being multiplied by a prespecified principal
• Daily expected return is assumed to be zero in
calculating the volatility or variance rate
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Variance Swaps
• The (risk-neutral) expected variance rate
between times 0 and T can be calculated from
the prices of European call and put options with
different strikes and maturity T
• Variance swaps can therefore be valued
analytically if enough options trade
• For a volatility swap it is necessary to use the
approximate relation
2)(ˆ
)var(
8
11ˆ)(ˆ
VE
VVEE
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VIX Index
• The expected value of the variance of the
S&P 500 over 30 days is calculated from
the CBOE market prices of European put
and call options on the S&P 500
• This is then multiplied by 365/30 and the
VIX index is set equal to the square root of
the result
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How Difficult is it to
Hedge Exotic Options?
• In some cases exotic options are easier
to hedge than the corresponding vanilla
options (e.g., Asian options)
• In other cases they are more difficult to
hedge (e.g., barrier options)
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Static Options Replication
(Hard Topic)
• This involves approximately replicating an exotic option with a portfolio of vanilla options
• Underlying principle: if we match the value of an exotic option on some boundary , we have matched it at all interior points of the boundary
• Static options replication can be contrasted with dynamic options replication where we have to trade continuously to match the option
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Using Static Options
Replication
• To hedge an exotic option we short
the portfolio that replicates the
boundary conditions
• The portfolio must be unwound when
any part of the boundary is reached