Fundamentals of Corporate Finance 3rd ed Jonathan Berk Ch12Word格式.docx
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Fundamentals of Corporate Finance 3rd ed Jonathan Berk Ch12Word格式.docx
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Theexpectedreturnonthisportfoliois19.8%.
3.Plan:
Performthecalculationstoanswerthequestionsintheproblem.
a.Let
bethenumberofsharesinstocki,then
Thenewvalueoftheportfoliois
b.Return
c.Theportfolioweightsarethefractionofvalueinvestedineachstock
a.Thenewvalueoftheportfoliois$232,500.
b.Thereturnontheportfoliowas16.25%.
c.Ifyoudonotbuyorsellsharesafterthepricechange,yournewportfolioweightsareGoldFinger51.61%,Moosehead16.13%,andVenture32.26%.
4.Plan:
Computetheweightsoneachinvestmentandthen,matchingthoseweightstotheexpectedreturns,computetheexpectedreturnoftheportfoliousingEq.12.3.
$38,000/$85,000=0.447,whichistheweightonthesecondstock.Sincetheweightsmustsumto1,theweightonthefinalstockis(1-0.447-0.25).
E[R]=(0.25)(0.18)+(0.447)(0.25)+(1-0.447-0.25)(0.22)=0.2234
Theexpectedreturnoftheportfolioisaweightedaverageoftheexpectedreturnsofthestocks.Thebiggestweightonanyindividualstockinthiscaseisthe44.7%onthestockwitha25%return.
5.Bothcalculationsofexpectedreturnofaportfoliogivethesameanswer.
6.Ifthepriceofonestockgoesup,theotherstockpricealwaysgoesupaswell.Similarly,ifonegoesdown,theotherwillalsobegoingdown.
7.Plan:
UseEqs12.3-12.5toanswerparts(a)and(b).UseEqs.12.3and12.4toanswerpart(c).
a.
b.
c.
Evenwithmostoftheportfolio’sweightontheriskierstock,thediversificationeffectbringstheoverallportfolioriskdownbelowaweightedaverageofthetwostandarddeviations.
8.Plan:
CalculatetheexpectedreturnandvolatilityofStockAandStockB.
RealizedReturns
Year
StockA
StockB
2005
-10%
21%
2006
20%
30%
2007
5%
7%
2008
-5%
-3%
2009
2%
-8%
2010
9%
25%
ThereturnonStockAis3.5%withavolatilityof10.60%.ThereturnonStockBis12%withavolatilityof15.65%.
9.Plan:
Calculatethevolatilityofaportfoliothatis70%investedinStockAand30%investedinStockB.
Thevolatilityofaportfolioof70%investedinStockAand30%inStockBis10.51%.
10.Plan:
CalculatetheaveragemonthlyreturnandvolatilityforthestockofColaCo.andGasCo.
Date
ColaCo.
GasCo.
Jan
–10.84%
-6.00%
Feb
2.36%
1.28%
Mar
6.60%
–1.86%
Apr
2.01%
–1.90%
May
18.36%
7.40%
June
–1.22%
-0.26%
July
2.25%
8.36%
Aug
–6.89%
–2.46%
Sep
–6.04%
–2.00%
Oct
13.61%
0.00%
Nov
3.51%
4.68%
Dec
0.54%
2.22%
ThemeanforColaCo.is2.02%;
themeanforGasCo.is0.79%.
Thestandarddeviation(i.e.,volatility)forColaCo.is8.24%;
thestandarddeviationforGasCo.is4.25%.
ColaCo.hasahighermeanreturn(2.02%)thanGasCo.(0.79%).ButColaCo.hasmorevolatility(8.24%)thanGasCo.(4.25%).ThisisconsistentwithFinanceTheory—higherriskisassociatedwithhigheraveragereturn.
11.Allthreemethodshavethesameresult:
Thestandarddeviation(i.e.,volatility)is5.90%.
12.
13.Microsoft’sσ=0.28;
Ford’sσ=0.59;
ThecorrelationbetweenMicrosoftandFordis0.36,andtheweightsare50%each:
14.Plan:
UseEqs.12.3and12.4tocomputetheexpectedreturnandvolatilityoftheindicatedportfolio.
Inthiscase,theportfolioweightsarexj=xw=0.50.FromEq.(12.3),
Wecantakethesquarerootoftheportfoliovarianceequation(Eq.12.4),togetthestandarddeviation.
Theportfoliowouldhaveanexpectedreturnof8.5%andastandarddeviationofreturnof14.1%.Therelativelylowcorrelationcoefficienthelpsreducetheriskoftheportfolio.
15.
Volatilityofportfolioislessifthecorrelationis<
1.
16.
17.Plan:
YoumustestimatetheexpectedreturnandvolatilityofeachportfoliocreatedbyaddingStockAorStockB.Youwillselectthatportfoliothatgivesyouthegreatestreturnortheleastvolatility.
Theexpectedreturnoftheportfoliowillbethesame(17.4%)ifyoupickAorBbecausebothAandBhavethesameexpectedreturn.Therefore,thechoiceofAorBdependsonhowriskytheportfoliobecomeswhenyouaddAorB.
ForA:
ForB:
BecausetheportfolioislessriskywhenAisadded,youshouldaddAtotheportfolio.
18.Plan:
StocksBandCareidenticalexceptforthefactthatStockBhasalowercorrelationwithAthanCdoes.GiventhatBandC’sstandarddeviationsarethesame,theonewiththelowercorrelationwithAwillproducealowerportfoliostandarddeviation.Becauseshewillbeputting$100,000ineachstock,herportfoliowillbe50%ineachstock.
UsingB:
YoucanconfirmthatthisislowerthanthestandarddeviationofaportfoliowithAandC:
BychoosingthestockthathasthelowercorrelationwithA,youcanachievethegoalofanexpectedreturnof14%withalowerstandarddeviationthanifyouhadchosenthestockwith
thehighercorrelation.
19.Plan:
Computethetotalmarketvalueofthetotalportfolioandtheweightedpercentthateachindividualstockwouldbeinthemarketportfolio.
Totalvalueofthemarket
Stock
PortfolioWeight
A
B
C
D
E
Themarketportfoliowouldhaveavalueof$1.314billion.StockAwouldbe7.61%ofthemarketportfolio,StockBwouldbe18.26%,StockCwouldbe1.83%,StockDwouldbe3.81%,andStockEwouldbe68.49%.
20.Plan:
Totalvalueofallfourstocks
GoldenSeas
JacobsandJacobs
MAG
PDJB
Themarketportfoliowouldhaveavalueof$1,380.5billion.GoldenSeaswouldbe0.942%ofthemarketportfolio,JacobsandJacobswouldbe1.992%,MAGwouldbe93.444%,andPDJBwouldbe3.622%.
21.Nothingneedstobedone.Theportfolioisstillvalue-weighted.
22.Plan:
ComputetheexcessreturnsofAppleandProctor&
Gamble.
a.ThebestguesstoApple’sreturntodayistheproductofthemarketreturnandApple’sbeta.Apple’sreturn
b.P&
G’sreturn
Apple’sexcessreturnis–2.8%,andP&
G’sis–1.0%.
23.Plan:
GototheMyFinanceLabWebsiteandaccesstheExcelspreadsheet.Usetheslopefunctiontoestimatetheslopecoefficientofthedata,whichisourestimateofbeta.
UsingExcel’sslopefunction,thebetaofNike’sstockis0.64.
TheestimateofbetaforNikeis0.64.
24.Plan:
a.SolvingforMicrosoft’sbetausingtheslopefunctioninExcel:
1987–1991:
1.4110
1992–1996:
0.8544
1997–2001:
1.8229
2002–2006:
1.0402
b.Itdecreasedintheearly1990sasMicrosoftestablisheditselfasthedominantoperatingsoftwarecompanybutincreasedduringtheInternetbubbleinthelate1990s(whentechstocksweresoaring).Ithassincedecreased.
25.Plan:
ComputetheexpectedreturnforJohnson&
Johnson.
TheexpectedreturnforJohnson&
Johnsonis14.8%.
26.Thesignoftheriskpremiumforanegativebetastockisnegative.Thisisbecausethenegativebetastockactsas“recessioninsurance,”andthusinvestorsarewillingtopayforthisinsuranceintheformofalowerreturnthantherisk-freerate.
27.Plan:
Thebetaofaportfolioisaweightedaverageofthebetasofthestocksintheportfolios.Theweightsaretheweightsofthestocksintheportfolios.
Becausebetasonlyrepresentnondiversifiablerisk,thereisno“diversificationeffect”onbetafromaportfolio.So,thebetaofaportfolioissimplytheweightedaverageofthebetasofthesecuritiesintheportfolio.
28.
29.Plan:
ComputetheexpectedreturnsofIntelandBoeingaswellastheportfoliobeta.Thencomputetheexpectedreturnoftheportfolio.
a.Intel’sExpectedReturn=5%1.8(0.15−0.05)=23%
b.Boeing’sExpectedReturn=5%+1.2(0.15–0.05)=17%
c.PortfolioBeta=(70%)(1.8)+(30%)(1.2)=1.62
d.Portfolio’sExpectedReturn=5%+1.62(0.15–0.05)=21.2%
orPortfolio’sExpectedReturn=(70%)(23%)+(30%)(17%)=21.2%
EvaluateIntel’sexpectedreturnis23%,Boeing’sexpectedreturnis17%,theportfoliobetais1.62,andtheexpectedreturnoftheportfoliois21.2%.
*30.Plan:
Computethenecessarybeta.
Returnonthestock=(1.5+122–103)/103=19.9%
For19.9%tobetheexpectedreturnonthesto
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