lecture 10 - futures options
DESCRIPTION
sTRANSCRIPT
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FuturesOptions
FNCE30007DerivativeSecurities/Lecture10
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Schedule
2
IntroductiontoOptions
PropertiesofStockOptions
TheBinomialModel
TheBlackScholesMertonModel
DividendsandOptionsonOther
InstrumentsTheGreeksFuturesMarkets
HedgingwithFuturesandForwards
ForwardandFuturesPrices FuturesOptions Swaps
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Outlineandreadings
3
Outline Futuresoptions PutCallparityforfuturesoptions Boundsforfuturesoptions Valuingfuturesoptions Futuresoptionpricesvs.spotoptionprices
Readings Hull,7th/8th ed.,chapter16
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FuturesOption
4
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Futuresoption
5
Afuturesoptionistheright,butnottheobligation,toenterintoafuturescontractatacertainfuturespricebyacertaindate. Callfuturesoption:righttoenterintoalongfuturescontract. Putfuturesoption:righttoenterintoashortfuturescontract.
MostfuturesoptionsareAmerican.
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Mechanicsofcallfuturesoptions
6
Whenacallfuturesoptionisexercisedtheholderacquires:
Alongpositioninthefutures. Acashamountequaltotheexcessofthefuturespriceat
previoussettlementoverthestrikeprice.
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Mechanicsofcallfuturesoptions example
7
ConsiderapositioninaJulycallfuturesoptionongoldwithastrikepriceof$300perounce.Theassetunderlyingonecontractis100ounces.Supposethatthemostrecentsettlementpricewas$325andtheoptionisexercisedwhentheJulygoldfuturespriceis$328.
Theinvestorreceives(325 300)(100)=$2,500. Theinvestorreceivesalongfuturescontract. Iftheinvestorclosesoutthefuturescontractimmediately,
thegainwouldbe(328325)(100)=$300. Totalpayoff=2,500+300=$2,800.
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Mechanicsofputfuturesoption
8
Whenaputfuturesoptionisexercisedtheholderacquires:
Ashortpositioninthefutures. Acashamountequaltotheexcessofthestrikepriceoverthe
futurespriceatprevioussettlement.
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Mechanicsofputfuturesoption
9
ConsiderapositioninaSeptemberputfuturesoptiononcornwithastrikepriceof$2.00perbushel.Eachcontractison5,000bushels.Supposethatthemostrecentsettlementpricewas$1.89andtheoptionisexercisedwhentheSeptembercornfuturespriceis$1.90.
Theinvestorreceives(2.00 1.89)(5000)=$550 Theinvestorreceivesashortfuturescontract Iftheinvestorclosesoutthefuturescontractimmediately,
thelosswouldbe(1.90 1.89)(5000)=$50 Totalpayoff=550 50=$500
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Thepayoffs
10
Ifthefuturespositionisclosedoutimmediately: Payofffromcall=F K (328 300)(100)=$2,800. Payofffromput=K F (2.00 1.90)(5000)=$500.whereFisfuturespriceatthetimeofexercise.
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Potentialadvantagesoverspotoptions
11
Futurescontractmaybeeasiertotradethanunderlyingasset(liquidityargument).
Exerciseoftheoptiondoesnotleadtodeliveryoftheunderlyingasset(mostfuturescontractsareclosedoutpriortodelivery).
Futuresoptionsmayentaillowertransactionscosts.
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PutCallParityforFuturesOptions
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Putcallparityforfuturesoptions
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Considerthefollowingtwoportfolios: EuropeancallfuturesoptionplusKerT ofcash EuropeanputfuturesoptionpluslongfuturespluscashequaltoF0erT.
TheymustbeworththesameattimeTsothat
c+KerT =p+F0 erT
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Putcallparity example
14
SupposethatthepriceofaEuropeancalloptionongoldfuturesfordeliveryinninemonthsis$10.50perouncewhentheexercisepriceis$900.Assumethatthegoldfuturespricefordeliveryinninemonthsiscurrently$875,andtheriskfreerateis%10perannum.FindthepriceofaEuropeanputoption.
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PutcallparityforAmericanfuturesoptions
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PutcallparityforAmericanfuturesoptionsisF0 erT K
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BoundsforFuturesOptions
16
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Boundsforfuturesoptions
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Europeanoptionsc(F0 K)erT
p(K F0)erT
AmericanoptionsCF0 K
PK F0
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ValuingFuturesOptions
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Valuingfuturesoptions
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Aonemonthcalloptiononfutureshasastrikepriceof29.
Futuresprice=$30Optionprice=?
Futuresprice=$33Optionprice=$4
Futuresprice=$28Optionprice=$0
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Settinguparisklessportfolio
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ConsiderthePortfolio:long futuresandshort1calloption
Portfolioisrisklesswhen3 4=2 or =0.8
3 4
2
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Valuingtheportfolio
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Therisklessportfoliois:long0.8futures+short1calloption.
Thevalueoftheportfolioin1monthis$1.6. Assumethattheriskfreerateis6%perannum.Then,thevalueoftheportfoliotodayis$1.6e 0.06/12=$1.592.
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Valuingtheoption
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Theportfoliothatislong0.8futures+short1optionisworth$1.592.
Thevalueofthefuturesiszero. Thevalueoftheoptionmustthereforebe$1.592.
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Generalization
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Generalizationofbinomialtreeexample
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AderivativelastsfortimeT andisdependentonafutures
F0
F0uu
F0dd
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Generalization
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Considertheportfoliothatislong futuresandshort1derivative
Theportfolioisrisklesswhen
0 0u d f
F u F d
F0u F0 u
F0d F0 d
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Generalization
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ValueoftheportfolioattimeT is=F0u F0 u
Valueofportfoliotodayis
Hence= [F0u F0 u]erT
Substitutingfor weobtain=[pu +(1 p)d ]erT
where 1 dpu d
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Valuingafuturesoption example
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Supposeu=1.1,d=0.9333,r=0.06,T=1month,fu =4andfd =0.Findthevalueofthefuturesoption.
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Growthratesforfuturesprices
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Afuturescontractrequiresnoinitialinvestment. Inariskneutralworldtheexpectedreturnshouldbezero.
Theexpectedgrowthrateofthefuturespriceisthereforezero.
Thefuturespricecanthereforebetreatedlikeastockpayingadividendyieldofr.
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ValuingEuropeanfuturesoptions
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WecanusetheBSMformulaforanoptiononastockpayingacontinuousyield.SetS=currentfuturesprice(F0)Setq=domesticriskfreerate(r)
Settingq=rensuresthattheexpectedgrowthoffuturespriceinariskneutralworldiszero.
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Blacksmodel
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TheformulasforEuropeanoptionsonfuturesareknownasBlacksmodel.
0 1 2
2 0 1
01
02 1
( ) ( )
( ) ( )
where2ln( / ) /2
2ln( / ) /2
rT
rT
c e F Nd K Nd
p e K N d F N d
F K Td
T
F K Td d T
T
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Blacksmodel example1
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ConsideraEuropeanputfuturesoptiononcrudeoil.Thetimetotheoptionsmaturityisfourmonths,thecurrentfuturespriceis$20,exercisepriceis$20,theriskfreerateis9%perannum,andthevolatilityofthefuturespriceis25%perannum.Findthefuturesoptionsprice.
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Blacksmodel example1
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F0 =20,K=20,r=0.09T=4/12 =0.25andln(20/20)=0so,
2
1
2
1
2( 0.09 )(4 /12)
/ 2 0.07216 0.072
0.07216 0.072
( ) ( 0.07) 0.4721( ) (0.07) 0.5279
[(20)(0.5279) (20)(0.4721)] $1.08
T TdTTd
N d NN d Np e
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Blacksmodel example2
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Considera6monthEuropeancalloptiononspotgold. 6monthfuturespriceis$620,6monthriskfreerateis5%,strikepriceis$600,andvolatilityofthefuturespriceis20%.
ValueofoptiongivenbyBlacksformulawithF0=$620,K=600,r =0.05,T =0.5,and=0.20is$43.83.
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FuturesOptionPricesvs.SpotOptionPrices
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Futuresoptionpricesvs.spotoptionprices
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Iffuturespricesarehigherthanspotprices(normalmarket)then AnAmericancallonfuturesisworthmorethanasimilarAmericancallonspot.
AnAmericanputonfuturesisworthlessthanasimilarAmericanputonspot.
Whenfuturespricesarelowerthanspotprices(invertedmarket)thereverseistrue.