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Callable Bonds & Swaptions
Callable Bonds & Swaptions
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Outline
PART ONE
! Chapter 1: callable debt securities generally; intuitive approach to pricing embedded call
! Chapter 2: payer and receiver swaptions; intuitive pricing approach
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Outline
PART TWO
! Chapter 3: standard pricing model for European swaptions
! Chapter 4: standard pricing model for European and Bermudan callable bonds
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Outline
PART THREE
! Chapter 5: applications involving swaptions and callable bonds; combining swaptions with callable bonds to provide cost-efficient financing
! Chapter 6: Quiz
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Chapter 1
! Introduce callable debt securities
! Intuitive approach to pricing embedded call
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! Simplest form of callable bond is one that contains single option to prepay instrument on one specific future date prior to maturity
! Example:
" ABC is able today to issue 5-year debt at par, paying 6% s.a.
" ABC anticipates that rates will decline significantly in next couple of years, and would like to refinance fixed-rate debt at lower cost when this occurs
" ABC proposes to investor 25 bps yield pick-up, to 6.25%, in return for allowing ABC, on bond’s second anniversary, to prepay it in whole at par
Callable bonds: introduction
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! If issuer view is right, issuer will be able in 2 years’ time to issue
3-year debt at substantially lower rate than those prevailing on day
one
! Issuer would prepay outstanding bond and reissue for remaining 3years at lower rate
! Brings aggregate cost for entire 5-year period potentially lower than 6% originally available on 5-year straight debt
Callable bond: issuer benefits
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Callable bond: sample term sheet
6.25%, paid semi-annuallyCoupon
The bond may be prepaid on its second anniversary at par (plus accrued and unpaid interest)
Prepayment
Senior unsecuredStatus
5 yearsTenor
$100Issue price
$100Face Value
Company ABCIssuer
Term Sheet
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! On second anniversary, assume ABC can issue 3-year non-callable debt at 5% s.a.
! ABC would call original debt at par
! ABC would refinance it for 3 years at 5%
! ABC’s all-in cost over entire 5-year period would fall between 6.25% and 5%
Scenario analysis
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Principal 100 -100.000Coupon yrs 1-2 6.25% 3.125Coupon yrs 3-5 5.00% 3.125
3.1253.1252.5002.5002.5002.5002.500
102.500
Semi-annual IRR 2.77%
Annualized IRR 5.54%
Calculating All-in Cost Over 5 Years
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Scenario analysis
RefinanceRefinanceLeave original
bond outstandingOutcome
AIC < 6%6% < AIC < 6.25%AIC = 6.25%All-in-cost
3
Rate < 5.81%
2
6.25% > Rate > 5.81%
1
Rate > 6.25%Scenario
3-year rate on second anniversary
►By issuing callable, issuer is implicitly assuming that 3-yr rates have reasonable probability, on second anniversary, to have fallen below 5.81% from current level
►Not sufficient for rates generally to decline for issuer to save money►They must decline enough so issuer savings in years 3-5 > coupon premium incurred in years 1-2 on PV basis
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! Often call right is not “European”, but “Bermudan”; so rather than arising only on a specific anniversary, right arises on any coupon payment date on or after that specific anniversary
! Call price may not be exactly par: common to set call price > par if bond is called early, then have call price decline gradually towards par the later the call date
Call provision: alternative styles
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“Bermudan” callable bond
Term Sheet
Issuer Company ABC
Face Value $100
Issue price $100
Tenor 5 years
Status Senior unsecured
Coupon 6.35%, paid semi-annually
Prepayment The bond may not be prepaid until the second anniversary. On or after the second anniversary, the bond may be prepaid as follows:
"If called on the second anniversary, call price is 101.60
"If called on the third anniversary, call price is 100.80; and
"If called on the fourth anniversary, call price is 100 (par)
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! Call price premium compensates investor for early call, since investor undertook process of obtaining internal approvals and reviewing documentation, and incurred significant legal expenses
! Also investor may have to reinvest returned principal at unattractive levels, given decline in interest rates, impacting portfolio performance
! This is classic reinvestment risk
! Note 0.10% additional coupon under Bermudan alternative, and step-down in call price from 101.80 to 100 over time
! Both features are consistent with greater issuer flexibility allowed by Bermudan call relative to European
Bermudan callable – investor perspective
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-100.000 Principal 100
3.1753.1753.175
3.175 Coupon Call Price
3.175 Years 1-3 6.35% 100.803.975 Years 4-5 5.50%
2.7502.7502.750
102.750
Semi-annual IRR 3.10%
Annualized IRR 6.20%
Calculating Breakeven for Call on Third Anniversary
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Breakevens for Bermudan callable
5.14%
Second
Anniversary
Breakeven rate on call date for
remaining tenor
4.96%
Third
Anniversary
4.37%
Fourth
Anniversary
Breakeven Rate
Called on
!The later issuer exercises call and refinances, the more rates
for remaining maturity must decline to achieve breakeven
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! If interest rates change rapidly, and by large amounts, value to
issuer of bond prepayment privilege > than if rates stable
! Chances that rates will fall below breakeven level are greater in
more volatile markets.
! Manifests itself in larger upward adjustment for callable bond
coupon versus non-callable alternative than in markets with stable
rates
! Restatement of principle that options on high volatility assets are
more valuable than options on low volatility assets
Volatility: intuitive impact on call price
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! Intuitively would expect that flat curve implies higher chance of
declining rates than steep curve, so prepayment option should be
more expensive for issuer when curve is flat
! But offsetting this is fact that when curve is steep, shorter rates are
lower than longer rates, so even absent any drop in rates it may
make sense to refinance, just to take advantage of the curve
“rolldown” effect
Effect of curve shape
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! Assume flat curve at 6%, and 5-year bond callable only on first
anniversary. Pricing model has led you to 6.25% coupon for
callable alternative
! In one year, 4-year rate, currently at 6%, needs to have fallen or
remained same, or have risen no higher than 6.25%, i.e. by no
more than 25 bps, for bond to be worth refinancing
Effect of curve shape
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! Now assume a positive curve, whose 5-year point is still at 6%, but
whose 4-year point is presumably lower, at 5.50% say. Again we
suppose bond callable on first anniversary comes with 6.25%
coupon
! True, curve shape implies generally higher probability of rate
increase, which appears to diminish value of prepayment option;
but offsetting this is fact that refinancing still makes economic
sense if, in one year, 4-year rate has risen no more than 75 bps,
versus only 25 bps with flat curve
! In fact option with flat curve still turns out generally more valuable
than with steep curve, but simple intuition is not sufficient to lead to
correct result
Effect of curve shape
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Chapter 2
! Introduce payer and receiver swaptions
! Intuitive approach to pricing
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! Borrower has 5-year debt at L + 75 bps, and is worried that rates may increase
! Borrower could simply swap from floating to fixed; if 5-year swap rate is 6%, all-in cost would come to 6.75%
! Borrower is contemplating currently divestiture of a division, expected to close in one year, which if implemented would enablehim to prepay loan and eliminate interest rate worries
! Should divestiture not close, borrower would like to switch intofixed
Swaptions: introduction
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Rather than enter immediately into 5-year swap, borrower pays upfront premium of 80 bps for right to enter 4-year swap at 6% (against Libor) inone year’s time, where borrower pays fixed
Swaption as flexible hedge
! Debt prepaid
! Exercise swaption
! Assign swap to bank (unwind) and collect FMV
! Exercise the swaption and fix debt at 6%
! Debt prepaid
! Swaption is worthless so no exercise
! No exercise:
! Either retain floating debt at L+75bps, or
! Swap at prevailing market rate
Divestiture
4-yearswap > 6%
4-yearswap < 6%
SuccessFailure
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Swaption term sheet
6m LiborSwap floating rate
30/360Fixed rate convention
BankParty paying floating
Act/360Floating rate convention
Term Sheet
6%, payable semi-annuallySwap fixed rate
BorrowerParty paying fixed
4 yearsUnderlying swap tenor
1 yearSwaption tenor
0.80%, payable upfrontPremium
$100 millionNotional
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Borrower has purchased a payer swaption; in reference to fact that he is party acquiring option, and option gives him right to pay
fixed rate of 6% under underlying swap
We always link position to swap’s fixed leg
Bank is described as having sold a payer swaption
Note very importantly: verb “purchase” which applied to borrower becomes “sell” from bank’s perspective; but underlying swap is still a “payer” and does not become a “receiver”
Swaption terminology
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Now assume investor owns FRN paying Libor flat, and is worried that rates may diminish, so is considering entering a receive-fixed swap to create a synthetic fixed-rate investment
Investor however is still uncertain about direction of rates near-term, so rather than enter into swap immediately, he pays 80 bpsupfront to bank, in return for right, in one year’s time, to receive
fixed at 6% and pay Libor for another 4 years
We say in this case investor has bought receiver swaption, and that bank has sold receiver swaption
Swaption terminology
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We refer to swaption with which we began chapter as a 1 x 4
First figure (“1”) indicates tenor in years until option expiration, and second figure (“4”) indicates tenor of underlying swap from date of option expiration, i.e. from when swap comes alive
Swaption notation
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Swaption risk factors
PayerReceiver
ShortLongShortLong
Vol Down +–+
–+–+Vol Up
–
–++–Curve Up
+––+Curve Down
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Short vol swaption trade
What should trader do if she has no strong directional view on curve shifts, but believes vols are unsustainably high and very likely to decline?
Trader sells swaption “straddle”, i.e. sells both receiver and payer with same strike, and earns two upfront premiums
Assuming rates do not move too much (in either direction), she enjoys large gain from diminution in vols
Any loss on either position from curve movement, if it is not too large, will be offset to some degree by gain on other position, but probably not of same magnitude
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Swaptions may be European or Bermudan or even American
Bermudan version may be exercised on more than one single date, but is still limited to specific dates only
American swaption may be exercised on any date prior to expiration
Swaption variations
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Additional issue (relevant to Bermudan and American alternativesonly):
! is tenor of underlying swap fixed upfront (“constant maturity swaption”), or
! does it depend on date of exercise, diminishing in tenor the later the exercise date (“remaining maturity swaption”)
Most common version of “remaining maturity swaption” fixes maturity date of underlying swap irrespective of option exercisedate.
So if a 5x5 Bermudan is exercised after 3 years, underlying swapwould have 7-year tenor; but if exercise happens one year later, underlying swap’s tenor would be 6 years
Swaption variations
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Constant v. remaining maturity
6%, s.a. (30/360)6%, s.a. (30/360)Swap strike
Bank BankParty paying floating (6-mo. Libor, A/360)
BorrowerBorrower Party paying fixed
,where n is number of years elapsed since trade date
4 yearsUnderlying swap tenor
Option may be exercised on any of 1st, 2nd, 3rd, or 4th anniversary after trade date
Option may be exercised on any of 1st, 2nd, 3rd or 4th
anniversary after trade date
Swaption tenor
0.90%, payable upfront1.00%, payable upfrontPremium
$100 million$100 millionNotional
Alternative 2 (“remaining
maturity swap”)
Alternative 1 (“constant
maturity swap”)
(5-n) years
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Under Alternative 1, underlying swap tenor is always 4 years, irrespective of exercise date
Under Alternative 2, tenor diminishes the later the exercise date and always equals remaining number of years since inception, assuming a total of 5 years
Constant v. remaining maturity
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Both versions are usually more expensive than European alternative, since they provide more flexibility to owner regarding exercise privilege
Alternative 1 is more expensive than Alternative 2, since it carries same number of exercise rights as Alternative 2, but involves underlying whose duration (price volatility) is higher than Alternative 2’s for all but first exercise date
Constant v. remaining maturity
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Buyer has right, but not obligation, on (or sometimes before) option expiration date, to enter cross-currency swap at pre-determined notionals, coupons and tenor
International borrower issues 7-year USD debt, but purchases option to swap last 5 years of debt’s coupons, as well as principal repayment, into EUR if he sees risk of USD appreciating against EUR
Swaption alternative: cross-currency swaption
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Cross-currency swaption
1) At inception
2) At swaption expiration, if swaption exercised
3) Periodic payments under CCS
4) At CCS maturity
► Index can be floating or fixed with different frequencies and day-counts
SwaptionBuyer
Bank
Notional in CCY1
Notional in CCY2
Notional in CCY2
Notional in CCY1
Notional CCY2 x index 2
Notional CCY1 x index 1
Premium
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International borrower has substantial cash flows in both EUR and USD, so indifferent whether to issue in one currency or the other
Borrower can subsidize his funding cost by borrowing in EUR but granting to lender option to convert principal and coupons into USD at pre-determined rates and on pre-determined dates
Effectively embedding a cross-currency swaption into loan, whose premium may be paid upfront or, more typically, embedded in interest rate under loan facility
Swaption alternative: cross-currency swaption
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Option to enter basis swap on defined date in future and for defined term and notional amount
Example: bank pays counterparty upfront premium, in return for right to enter 5-year swap in 2 years’ time on $100 notional, under which bank pays 3m Libor and receives 6m Libor minus 25 bps, or pays 3m Libor and receives Fed Funds plus 50 bps
Swaption alternative: basis swaption
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Basis swaption
1) At inception
2) At swaption expiration, if swaption is exercised
3) Exchange of periodic payments
SwaptionBuyer
BankNotional x (Index2 + Spr2)
Basis Swaption
Premium
Notional x (Index1 + Spr1)
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Callable Bonds & Swaptions
(Part II)
Callable Bonds & Swaptions
(Part II)
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Outline
PART TWO
! Chapter 3: standard pricing model for swaptions
! Chapter 4: standard pricing model for callable bonds
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Chapter 3
! Standard pricing model for European swaptions
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Strike 6.00%Fwd Vol 30%Option Expiration 2Swap Tenor 5
Forward Swap 6.0000%Payer Swaption 3.8197%Receiver Swaption 3.8197%
Period FRA/Spot DFs Fixed PaymentsPV of Fixed
Payments
Floating
Payments
PV of
Floating
Payments
Principal
at Begin
1 6.00% 0.97 3.00 2.91 3.00 2.91 100
2 6.00% 0.94 3.00 2.83 3.00 2.83 100
3 6.00% 0.92 3.00 2.75 3.00 2.75 100
8 6.00% 0.79 3.00 2.37 3.00 2.37 100
9 6.00% 0.77 3.00 2.30 3.00 2.30 100
10 6.00% 0.74 3.00 2.23 3.00 2.23 100
11 6.00% 0.72 3.00 2.17 3.00 2.17 100
18 6.00% 0.59 3.00 1.76 3.00 1.76 100
19 6.00% 0.57 3.00 1.71 3.00 1.71 10020 6.00% 0.55 3.00 1.66 3.00 1.66 100
Pricing Swaption in Flat Curve Environment
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Strike 6.00% Forward Swap 7.0520%
Fwd Vol 30% Payer Swaption 6.4005%Option
Expiration 2 Receiver Swaption 2.4385%
Swap Tenor 5
PeriodFRA/
SpotDFs Fixed Payments
PV of Fixed
Payments
Floating
Payments
PV of
Floating
Payments
Principal
at Begin
1 5.00% 0.9756 3.0000 2.9268 2.5000 2.4390 100
2 5.25% 0.9507 3.0000 2.8520 2.6250 2.4955 100
3 5.50% 0.9252 3.0000 2.7756 2.7500 2.5443 100
8 6.75% 0.7933 3.0000 2.3798 3.3750 2.6773 100
9 7.00% 0.7665 3.0000 2.2994 3.5000 2.6826 100
10 7.25% 0.7396 3.0000 2.2189 3.6250 2.6812 100
11 7.50% 0.7129 3.0000 2.1387 3.7500 2.6734 10018 9.25% 0.5327 3.0000 1.5982 4.6250 2.4639 10019 9.50% 0.5086 3.0000 1.5257 4.7500 2.4157 10020 9.75% 0.4849 3.0000 1.4548 4.8750 2.3640 100
Pricing Swaption in Steep Curve Environment
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! Illustration of potential arbitrage if ATMF 2x5 payer is worth 4% while
ATMF 2x5 receiver is worth 3.75%.
Arbitrage strategy if payer/receiver parity does not apply
If swap rate in 2 years < strike
If swap rate in 2 years > strike
Bank 2Bank 1
Bank 3
Arbitrageur:Sell 2x5 payer
Upfrontpremium of 4%
Libor
fixed @ strike fixed @ strike
Libor
fixed @ strike
Buy 2x5 receiver
Upfront premium of
3.75%
Libor
2X5 forward-start swap
net profit of 25bps annuity
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Arbitrage strategies: payer/receiver parity
Outcome:
Receiver premium –
Payer premium
Payer premium –
Receiver premiumProfit
00Risk
Receive fixedPay fixedForward-start swap
ShortLongReceiver
LongShortPayer
Strategy:
ATMF Payer <
ATMF Receiver
ATMF Payer >
ATMF Receiver
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! Closed-form solution (available for pricing European swaption) not
applicable to Bermudan alternative, nor American one
! True of both constant-maturity swaption and remaining maturity
swaption
! Numerical solutions are required, typically involving binomial or
trinomial trees, similar to ones used in FX Options module
! Will illustrate binomial technique in next chapter, on callable bond
pricing
Bermudian swaption: pricing
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Chapter 4
! Pricing model for European and Bermudan callable bonds using binomial trees
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Period 0 1 2 3 Vol 10%
3.5000% 5.4289% 7.0053% 9.1986%4.4448% 5.7354% 7.5312%
4.6958% 6.1660%5.0483%
2-Year 4.2% Bond
Coupon 4.20
100.000 103.034 104.200103.966 104.200
104.200
3-Year 4.7% Bond
Coupon 4.70
100.000 102.523 102.546 104.700104.477 103.721 104.700
104.704 104.700104.700
Callable Bond Pricing (Low vol)
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4-Year 5.2% Bond
Coupon 5.20
100.000 101.961 100.789 101.538 105.200105.039 103.238 103.032 105.200
105.316 104.290 105.200105.344 105.200
105.200
4-Year 6.5% Bond
Coupon 6.50
104.643 106.730 104.425 104.029 106.500109.881 106.918 105.541 106.500
109.034 106.815 106.500107.882 106.500
106.500
4-Year 6.5% Bond Callable Every year at Par
Coupon 6.50Call Price 100
102.899 106.500 104.425 104.029 106.500106.500 106.500 105.541 106.500
106.500 106.500 106.500106.500 106.500
106.500
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4-Year 6.5% Bond Callable at 102 in Year 1, 101 in Year 2, and 100 in Year 3
Coupon 6.50Call Price EOY 1 102Call Price EOY 2 101Call Price EOY 3 100
103.942 106.660 104.425 104.029 106.500108.500 106.770 105.541 106.500
107.500 106.500 106.500106.500 106.500
106.500
4-Year Step-Up Note, Coupons 5.50% Years 1-2, 9.5% Years 3-4, Callable Every Year at Par
Coupon Yrs 1-2 5.50Coupon Yrs 3-4 9.50Call Price 100
102.453 105.567 105.500 109.500 109.500106.510 105.500 109.500 109.500
105.500 109.500 109.500109.500 109.500
109.500
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! Real tree would have many more time steps of substantially
shorter duration
! Precision of model increases as we increase number of time steps
Binomial tree: time steps
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! Investor has granted issuer option to prepay on any anniversary,
but coupon has not risen to compensate for this privilege
! So value of callable must be less than 104.643, price of non-
callable
Callable bond: pricing
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! Call option can be European, Bermudan or American
! Callable bond = Non-callable bond – call option
! Value of call option being positive in all case, callable bond is
worth < non-callable version, in all cases
Deconstruction of callable bond
Callablebond
Non-callablebond
Call option
–
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! Puttable bond = Non-puttable bond + put option
Deconstruction of puttable bond
Puttablebond
Non-puttablebond
Put option
+
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! Principal new feature in tree starting on Row 54, which reflects
issuer’s right to call at par, is stipulation that if price in that cell
obtained under normal formula exceeds call price plus accrued
interest – which would give issuer immediate arbitrage since he
could call the bond by paying 106.5 and then sell it for this higher
price – market would preempt this arbitrage by refusing to price
this instrument above 106.50
! Stated differently, no rational investor would agree to pay > 106.5
for this instrument on any call date, no matter what formula says,
since investor would face then immediate loss when bond is called
away at 106.5 exactly
Amending the tree
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! We know that
Callable Bond = Non-callable Bond – Call Option
! Also value of call option increases when vol rises
! Therefore increase in vol will reduce bond value further, pulling it
closer to 100
Amending the tree
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Period 0 1 2 3 Vol 20%
3.5000% 5.9194% 8.3440% 12.0003%3.9679% 5.5931% 8.0441%
3.7492% 5.3921%3.6144%
2-Year 4.2% Bond
Coupon 4.20
100.000 102.577 104.200104.423 104.200
104.200
3-Year 4.7% Bond
Coupon 4.70
100.000 101.562 101.337 104.700105.438 103.854 104.700
105.616 104.700104.700
Callable Bond Pricing (High vol)
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4-Year 5.2% Bond
Coupon 5.20
100.000 100.450 98.281 99.128 105.200106.550 103.495 102.568 105.200
107.248 105.018 105.200106.730 105.200
105.200
4-Year 6.5% Bond
Coupon 6.50
104.643 105.185 101.872 101.589 106.500111.427 107.180 105.071 106.500
111.000 107.551 106.500109.285 106.500
106.500
4-Year 6.5% Bond Callable Every year at Par
Coupon 6.50Call Price 100
102.108 104.864 101.872 101.589 106.500106.500 106.500 105.071 106.500
106.500 106.500 106.500106.500 106.500
106.500
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4-Year 6.5% Bond Callable at 102 in Year 1, 101 in Year 2, and 100 in Year 3
Coupon 6.50Call Price EOY 1 102Call Price EOY 2 101Call Price EOY 3 100
103.116 104.950 101.872 101.589 106.500108.500 106.682 105.071 106.500
107.500 106.500 106.500106.500 106.500
106.500
4-Year Step-Up Note, Coupons 5.50% Years 1-2, 9.5% Years 3-4, Callable Every Year at Par
Coupon Yrs 1-2 5.50Coupon Yrs 3-4 9.5Call Price 100
102.453 105.104 105.500 107.268 109.500106.974 105.500 109.500 109.500
105.500 109.500 109.500109.500 109.500
109.500
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! Remind you that this feature is common, to discourage early
redemption – or at least compensate investor if it does happen for
previous efforts – by paying her extra amount for her troubles
! Increase in call strike for first two exercise dates diminishes call
value
! So given equation
Callable Bond = Non-callable Bond – Call Option
! Anticipate increase in price of this bond versus previous version
Raising the strike
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! Trade-off between this bond and 6.5% bond callable at par on
each anniversary, priced at 102.899
! Earn 1% less under this version in Years 1-2, then potentially 3%
more in Years 3-4 if bond survives long enough
! Not enough to compare PV of 3%s to PV of foregone 1%s and
deduce this instrument (under this simple PV analysis) offers
better value
Comparison
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! Likelihood of actually receiving high coupon in Years 3-4 is
diminished by substantial probability bond will have been called by
then
! Involves probability-weighted comparison; tree enables this
comparison by solving for entire investment’s fair value, revealing
spot price of 102.453, so pointing to slight decline in value from
fixed-coupon alternative
! Quiz question will ask you to price puttable bond
Comparison
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Callable Bonds &Swaptions(Part III)
Callable Bonds &Swaptions(Part III)
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Outline
PART THREE
! Chapter 5: applications of swaptions and callable bonds
! Chapter 6: Quiz
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Chapter 5
! Applications of swaptions and callable bonds
! Combining swaptions and callable bonds to provide cost-efficient financing for issuers
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Extendible interest rate swap
! Gives owner right at specific time in future to extend swap
tenor for pre-determined period
! Example:
" Swap curve is flat at 6%
" Borrower contracted 7-year loan at L + 75 bps
" Borrower may prepay loan in two years from proceeds of
asset disposal; otherwise, loan will remain outstanding for
all 7 years
! Should borrower hedge debt with 2-year IRS, 7-year IRS, or something else?
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Extendible interest rate swap
! Either 2-year or 7-year IRS brings all-in-
cost to 6.75% fixed
! Could we construct 2-year IRS, extendible
at borrower’s option into 7-year IRS (to be
available if Borrower doesn’t prepay loan)
! What would be fixed rate under this instrument?
! Swap curve flat at 6%
! 7-year loan at L + 75
! May be prepaid in 2
years, otherwise
remains outstanding
for 7 years
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Extendible swap deconstruction
2-yr pay-fixed IRS extendible into 7-yr IRS at borrower’s option
=
Normal 2-yr pay-fixed IRS @ K%
+
2 x 5 bought payer swaption
! So borrower has fixed his cost for Years 1-2 at K%, and can extend
protection again at K% if he does not prepay loan and if K% rate is
still competitive under current market conditions
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Strike (K%) 6.00% Forward Swap 6.0000%
Fwd Vol 30% Payer Swaption 3.8197%
Option Expiration 2 Receiver Swaption 3.8197%
Swap Tenor 5
Spot 2-year swap 6.0000%
PV of K% swap 0.0000%
Extendible Swap 3.8197%
PeriodFRA/
SpotDFs Fixed Payments
PV of Fixed
Payments
Floating
Payments
PV of
Floating
Payments
Principal
at Begin
1 6.00% 0.971 3.000 2.913 3.000 2.913 100
2 6.00% 0.943 3.000 2.828 3.000 2.828 100
3 6.00% 0.915 3.000 2.745 3.000 2.745 100
10 6.00% 0.744 3.000 2.232 3.000 2.232 100
11 6.00% 0.722 3.000 2.167 3.000 2.167 100
12 6.00% 0.701 3.000 2.104 3.000 2.104 100
13 6.00% 0.681 3.000 2.043 3.000 2.043 100
14 6.00% 0.661 3.000 1.983 3.000 1.983 100
Extendible Swap Pricing
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Extendible swap valuation – achieving zero NPV
PV = 0
Off-market 2-yr pay-fixed IRS, fixed leg at
K%+
2x5 payer swaption on K%
swap
PV = – ve
2-yr pay-fixed IRS, extendible
into 7-yr IRS=
PV = + ve
Solve for fixed rate K% that achieves zero upfront NPV as per equation
below (which shows borrower perspective):
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Monetizing underlying option in callable bond
Swaptions can be used in connection with callable bonds to
generate cost savings for high-grade borrowers, such as FNMA and
other US agencies before credit crisis
Example:
! Assume AAA-rated FNMA can borrow for any maturity on fixed-
rate basis at swap rate flat
! Swap curve is perfectly flat at 6% and vols in swaption market
are 30% for any combination of maturity and strike
! Retail bond market investors buy callable bonds at small
coupon premium over non-callable bonds, say 50 bps,
irrespective of other specifics
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Monetizing underlying option in callable bond
FNMA could issue either 7-year straight debt at 6%, or 7-year debt
callable in 2 years (at par) at 6.50%
FNMA CFO has expressed strong preference for 7-year fixed-rate
funding, so is leaning away from callable instrument
However CFO recognizes that 50 bps annual coupon premium
appears modest relative to potential savings of refinancing at
potentially much lower 5-year rate in 2 years
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Monetizing underlying option in callable bond
Investors
At issuance:
FNMA issues 6.50% callable bond at par
FNMA sells 2x5 receiver for 88 bps annuity
FNMA BankCallable
Bond
88bps
Receiverswaption
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Residual risks for FNMA
Investors FNMA Bank6.50%
coupons
0.88%annuity
Scenario 1:
On second anniversary
If 5-yr IRS # 6.50%
Swaption lapses
! FNMA still pays 5.62% net
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Residual risks for FNMAScenario 2
OldInvestors
FNMABank
Par
FRN at
Libor
88bps
6.50%
Libor
NewInvestors
Par
Old bond
On second anniversary
If 5-yr IRS < 6.50%:
Swaption is exercised, FNMA pays 6.50% fixed and receives Libor
FNMA calls back old bonds
FNMA issues FRN at Libor
! FNMA pays 5.62% net
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FNMA is assured to pay fixed, directly or synthetically, for entire 7
years under either scenario
But FNMA received on Day 1 a premium whose annualized value
was 88 bps, bringing down effective all-in cost for 7 years to only
5.62% and saving it 38 bps net per annum
Conclusion
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Is example realistic? To what do we attribute significant value
generated for issuer?
Borrower has taken advantage of serious mis-pricing of interest
rate optionality in retail bond market that purchases FNMA paper
We demonstrated that 7-year callable bond issued by FNMA can
be decomposed into 7-year straight bond plus 2x5 receiver
swaption, priced in interbank swaption market at 88 bps per annum
Less sophisticated retail market, attracted to FNMA principally on
account of triple-A rating, considers 50 bps annually under callable
almost free money!
Monetizing underlying option in callable bond
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FNMA in effect is buying this option cheap in retail market, then
reselling it in market which appreciates its value fully and is
prepared to pay fair price
Savings of this size are unrealistic in US market, but still occur in
less liquid markets
Illustration is excellent example of arbitrage funding strategies
Monetizing underlying option in callable bond
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Infinite variety of structured investment products, relating to numerous
asset classes, from interest rates and FX to credit and commodities
Structured investment products
Consider investor who expects USD Libor to decline so asks to be shown
variety of inverse floaters:
1. You show her first simple vanilla alternative paying (10% – Libor) when curve
lies at 5%
2. Then you show her leveraged version paying 20% – (3 x L)
3. Then you improve this to 22% – (3 x L) but place a cap on her coupon at 13%
4. Next you make instrument callable on its first anniversary only, which enables
you to lift coupon to 23% – (3 x L)
5. Finally you make call Bermudan, and increase coupon to 24% – (3 x L)
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Process is one in which different features are added gradually to
structure, each introducing its own risks but enabling you to offer
“headline” coupon, in return for asking investor to accept additional
risks that may not trouble her
Last two steps involved inclusion of call feature to enhance yield,
initially European and then more expensive Bermudan version
Numbers in this example were not confirmed via pricing model
Structured investment products
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Chapter 6
! Quiz
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Question 1
! Using a Libor curve that lies completely flat at 6%, calculate first the rate on the fixed leg of a 7-year, semi-annual spot-starting swap.
! Then assuming the same vol input of 30% we used for swaptions throughout the module, combine a 7-year off-market rate spot-starting swap with a 2x5 receiver swaption to engineer a 7-year IRS cancelable on its second anniversary at the option of the fixed-rate payer, so that the NPV of the aggregate package is zero.
! What is the strike of this cancelable swap, accurate to two decimal places?
a) 6.83%b) 7.03%c) 7.23%d) 7.43%
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! Libor curve being flat at 6% means that all swap rates, whether spot-starting or forward-starting, lie at 6%
Solution to Question 1
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Strike (K%) 6.00% Forward Swap 6.0000%
Fwd Vol 30% Payer Swaption 3.8197%
Option Expiration 2 Receiver Swaption 3.8197%
Swap Tenor 5
Spot 2-year swap 6.0000%
PV of K% swap 0.0000%
Extendible Swap 3.8197%
PeriodFRA/
SpotDFs Fixed Payments
PV of Fixed
Payments
Floating
Payments
PV of
Floating
Payments
Principal
at Begin
1 6.00% 0.971 3.000 2.913 3.000 2.913 100
2 6.00% 0.943 3.000 2.828 3.000 2.828 100
3 6.00% 0.915 3.000 2.745 3.000 2.745 100
10 6.00% 0.744 3.000 2.232 3.000 2.232 100
11 6.00% 0.722 3.000 2.167 3.000 2.167 100
12 6.00% 0.701 3.000 2.104 3.000 2.104 100
13 6.00% 0.681 3.000 2.043 3.000 2.043 100
14 6.00% 0.661 3.000 1.983 3.000 1.983 100
Solution to Question 1
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Solution to Question 1
Initialposition:pay fixed under 7-yr swap
If holder exercisesswaption
+
1y 2y 3y 4y 5y 6y 7y
Receives L L L L L L L
Pays 7.23% 7.23% 7.23% 7.23% 7.23% 7.23% 7.23%
3y 4y 5y 6y 7y
Pays L L L L L
Receives 7.23% 7.23% 7.23% 7.23% 7.23%
=
1y 2y
ReceivesL L
Pays 7.23% 7.23%
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Solution to Question 1
Initialposition:pay fixed under 7-yr swap
Do nothingIf holder does not exercise
=
+
1y 2y 3y 4y 5y 6y 7y
Receives L L L L L L L
Pays 7.23% 7.23% 7.23% 7.23% 7.23% 7.23% 7.23%
1y 2y 3y 4y 5y 6y 7y
Receives L L L L L L L
Pays 7.23% 7.23% 7.23% 7.23% 7.23% 7.23% 7.23%
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! Put-call parity brings about this result
! More generally, swap with a maturity M years, extendible at one party’s option for N years at same fixed rate, is exactly equivalent in cash flows terms to swap with maturity (M+N) years (with same fixed rate as before), but cancelable inthat party’s option after M years
! Shape of the curve does not affect this outcome, which is true whether curve is flat, positive, inverted or humped
! Correct answer is (c)
Solution to Question 1
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Question 2
! Please answer this question assuming the same market data as in worksheet Callable Bonds.
! You are offered a 6.5% 4-year bond paying annual coupons and puttable on each anniversary by the investor to the issuer, at 98 on the first anniversary, 99 on the second, and 100 on the third, in each case plus accrued and unpaid interest.
! What is the fair value of this bond? You will need to adapt the binomial models provided for callable bonds so they can be used instead for puttable bonds
a) 99.87b) 101.22c) 101.85d) 105.22
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Period 0 1 2 3 Vol 10%
3.5000% 5.4289% 7.0053% 9.1986%4.4448% 5.7354% 7.5312%
4.6958% 6.1660%5.0483%
2-Year 4.2% Bond
Coupon 4.20
100.000 103.034 104.200103.966 104.200
104.200
3-Year 4.7% Bond
Coupon 4.70
100.000 102.523 102.546 104.700104.477 103.721 104.700
104.704 104.700104.700
4-Year 5.2% Bond
Coupon 5.20
100.000 101.961 100.789 101.538 105.200105.039 103.238 103.032 105.200
105.316 104.290 105.200105.344 105.200
105.200
Solution to Question 2
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4-Year 6.5% Bond Puttable at 98 in Year 1, 99 in Year 2, and 100 in Year 3
Coupon 6.50Put Price EOY 1 98Put Price EOY 2 99Put Price EOY 3 100
105.219 107.706 106.028 106.500 106.500110.098 107.372 106.500 106.500
109.034 106.815 106.500107.882 106.500
106.500
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Question 3
! The 5-year swap rate is 5% while the 10-year swap rate is 5.50%. A borrower with floating rate debt enters into a 5-year swap with HSBC, but which can be extended, in HSBC’s sole discretion, for 5 additional years at the same fixed rate as for the first 5 years.
! Which of the following is true? You may not use any spreadsheets to answer this question
a) The rate the borrower will pay on the fixed leg of the swap will be below 5%
b) The rate the borrower will pay on the fixed leg of the swap will be below 5.50% but not necessarily below 5%
c) The rate the borrower will pay on the fixed leg of the swap will be below 5.50% but above 5%
d) The rate the borrower will pay on the fixed leg of the swap will be above 5.50%
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! Problem leaves significant majority of people confused
! Many are inclined to assume that positive shape of yield curve pushes fixed leg of extendible swap above 5% level of spot-starting 5-year swap
! Simple observation dispels this illusion: extendible is sum of spot-start swap plus (or minus) swaption
! Here borrower has entered spot-starting 5-year swap at K%, but has also sold to bank 5x5 European receiver swaption, with strike K% as well
Solution to Question 3
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Solution to Question 3
PV = 0
Off-market 5-yr receive-fixed IRS,
fixed leg at K%+
5x5 receiver swaption on K%
swap
PV = – ve
5-yr receive-fixed IRS, extendible at bank’s option into
10-yr IRS
=
PV = + ve
!Fixed rate K% must achieve zero upfront PV as per equation below (which shows bank’s perspective)
!Thus the correct answer is (a)
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Question 4
! Using a Libor curve that is completely flat at 5% and a 30% vol for all interest rates, determine the rate on the fixed leg of a 5-year, semi-annual, interest rate swap for a borrower who wishes to pay fixed, and is eager to earn a subsidy by granting to the bank the right to double the swap’s notional amount on its first anniversary for its remaining life:
a) 4.58%
b) 4.66%
c) 4.88%
d) 4.98%
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! Structure – referred to sometimes as expandableswap – was not discussed in module
! Can intuit that bank’s right to double notional is long position in 1x4 swaption struck at same fixed rate as original swap
! If bank exercises option, swap notional for remaining life doubles, since swap underlying swaption and original swap have identical terms from that point until maturity
Solution to Question 4
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Solution to Question 4
PV = 0
Off-market 5-yr $100 receive-fixed IRS,
fixed leg at K%+
1x4 $100 receiver swaption on K%
swap
PV = – ve
5-yr $100 receive-fixed IRS,
expandable to $200 at bank’s option on first anniversary
=
PV = + ve
! Solve for fixed rate K% that achieves zero upfront NPV as per equation below (which shows bank perspective)
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Strike (K%) 5.00% Forward Swap 5.0000%
Fwd Vol 30% Payer Swaption 2.0343%
Option Expiration 1 Receiver Swaption 2.0343%
Swap Tenor 4
Spot 2-year swap 5.0000%
PV of K% swap 0.0000%
Extendible Swap -2.0343%
PeriodFRA/
SpotDFs Fixed Payments
PV of Fixed
Payments
Floating
Payments
PV of
Floating
Payments
Principal
at Begin
1 5.00% 0.976 2.500 2.439 2.500 2.439 100
2 5.00% 0.952 2.500 2.380 2.500 2.380 100
3 5.00% 0.929 2.500 2.321 2.500 2.321 100
10 5.00% 0.781 2.500 1.953 2.500 1.953 100
11 5.00% 0.762 2.500 1.905 2.500 1.905 100
12 5.00% 0.744 2.500 1.859 2.500 1.859 100
13 5.00% 0.725 2.500 1.814 2.500 1.814 100
14 5.00% 0.708 2.500 1.769 2.500 1.769 100
Solution to Question 4
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! Correct answer is (b)
! Expandable version of IRS appeals to borrowers who have no strong view on what maximum percentage of floating-rate debt should be swapped into fixed
! Consider for example borrower with $1BN of debt in aggregate, all of it currently floating, determined to swap at least $300MM but prepared to reach $600MM if right incentive is available
Solution to Question 4
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! Borrower could find very appealing immediate 34 bps of savings under first $300MM swap he initiates
! Downside is only that if rates have declined by first anniversary, notional of this swap doubles, but only at same fixed rate as original one
! Of course by that time 4.66% may not be that attractive relative to market rates for 4-year swaps
Solution to Question 4
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Question 5
! Assume a completely flat Libor curve at 4% (s.a.), and an annualized volatility for interest rates of 40%
! Assume also, as we did in Chapter 5, that FNMA is rated triple-A and can issue non-callable debt for any maturity at the swap rate flat or Libor flat
! Assume finally that FNMA debt containing a European call option of any tenor requires a 30 bps coupon premium for successful placement
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Question 5 (continued)
! How much would the issuer save, in basis points annually, if it issued a 5-year bond, paying coupons semi-annually and callable on its first anniversary, and immediately sold an appropriate swaption to lock in guaranteed 5-year fixed-rate funding under any interest rate scenario?
! You are encouraged to use the same approach we used in Chapter 5 to answer this question.
a) 12b) 23c) 32d) 41
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Strike 4.30% Forward Swap 4.0000%
Fwd Vol 40% Payer Swaption 1.8251%Option
Expiration 1 Receiver Swaption 2.8813%
Swap Tenor 4 Annualized 0.6415%receiver premium
Period FRA/Spot DFs Fixed Payments
PV of
Fixed
Payments
Floating
Payments
PV of
Floating
Payments
Principal
at Begin
1 4.00% 0.980 2.150 2.108 2.000 1.961 100
2 4.00% 0.961 2.150 2.067 2.000 1.922 100
3 4.00% 0.942 2.150 2.026 2.000 1.885 100
10 4.00% 0.820 2.150 1.764 2.000 1.641 100
11 4.00% 0.804 2.150 1.729 2.000 1.609 100
12 4.00% 0.788 2.150 1.695 2.000 1.577 100
13 4.00% 0.773 2.150 1.662 2.000 1.546 100
14 4.00% 0.758 2.150 1.629 2.000 1.516 10015 4.00% 0.743 2.150 1.597 2.000 1.486 100
16 4.00% 0.728 2.150 1.566 2.000 1.457 10017 4.00% 0.714 2.150 1.535 2.000 1.428 10018 4.00% 0.700 2.150 1.505 2.000 1.400 10019 4.00% 0.686 2.150 1.476 2.000 1.373 10020 4.00% 0.673 2.150 1.447 2.000 1.346 100
Solution to Question 5
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Solution to Question 5
Investors FNMA Bank4.30%
coupons
64bps
! If 4-yr IRS ! 4.30% on first anniversary
! Swaption lapses
! FNMA still pays 3.66% net
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Solution to Question 5
Old
Investors
FNMA BankPar
FRN at
Libor
64bps
4.30%
Libor
New
Investors
Par
Old bond
! If 4-yr IRS < 4.30% on first anniversary
! Swaption is exercised, FNMA pays 4.30% fixed and receives Libor
! FNMA calls back old bonds
! FNMA issues FRN at Libor
! FNMA pays 3.66% net
! So correct answer is (c)
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Question 6
! Turkey can borrow at 5% for 5 years in either Euros or US dollars. Spot and forward FX rates for EUR/USD are 1.50 for all maturities.
! Since the country has significant remittances in both of these currencies from a combination of exports (mostly in US dollars) and worker remittances (mostly in Euros), Deutsche Bank proposes to Turkey that it borrow EUR 100 MM for 5 years at 3%, provided that on the loan’s first anniversary Deutsche can, in its sole discretion, convert half the loan into a 4-year USD 75MM loan at 3%, and on the second anniversary Deutsche can, in its sole discretion, convert the second half of the loan into a 3-year USD 75MM loan at 3%.
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Question 6 (continued)
! How might you deconstruct the loan described above:
a) Turkey has borrowed EUR 100MM at market rates and has also bought one or more European cross-currency swaptions
b) Turkey has borrowed EUR 100MM at market rates and has also bought one or more Bermudan cross-currency swaptions
c) Turkey has borrowed EUR 100MM at market rates and has also sold one or more European cross-currency swaptions
d) Turkey has borrowed EUR 100MM at market rates and has also sold one or more Bermudan cross-currency swaptions
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! To achieve 2% subsidy over normal 5-year rates Turkey must have sold optionality to Deutsche, not bought it
! And since each right to convert portion of loan into USD can be exercised on one specific date only,these are European options, not Bermudan
Solution to Question 6
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! In addition to borrowing EUR 100MM for 5 years, Turkey has sold to Deutsche
i. 1x4 cross-currency swaption enabling Deutsche on loan’s first anniversary to initiate cross-currency swap with Deutsche under which Deutsche will deliver EUR and receive USD, with notionals of EUR 50 and USD 75MM, and
ii. 2x3 cross-currency swaption enabling Deutsche on loan’s second anniversary to initiate a cross-currency swap with Deutsche under which Deutsche will deliver EUR and receive USD, with notionals of EUR 50 and USD 75MM
Solution to Question 6
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! Premium earned from selling these two cross-currency swaptions is built into loan and reduces interest rate to 3% in either currency
! Therefore correct answer is (c)
Solution to Question 6
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