CF 473.32 10 Winter 2014. Questions 1. What cash flows should I consider? 2. How does the market set...
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Transcript of CF 473.32 10 Winter 2014. Questions 1. What cash flows should I consider? 2. How does the market set...
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CF
473.32
10
Winter 2014
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Questions
1. What cash flows should I consider?
2. How does the market set r?
3. How should I set r?
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2. Market r
1957-2002
6.42
3.40
2.13
risk
premium
%
13.31small stocks
r
10.29common stocks
9.01 long bonds
6.89treasury bills
1970-2002
inflation 4.35 %
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2. Market rReal-World Bonds
perceived risk = required return
flexibility = required return
exactly the same rules for any investment
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2. Market rExpected return from market
Expected return from Treasury Bills considered risk-free
Risk premium “extra” return earned for taking on risk
emr
fr
femp rrr
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2. Market r
risk
return
rfinflation
t-bills
averagerisk
average return
rp
rem
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2. Market r
risk
return
rfinflation
t-bills
SML
averagerisk
average returnlower return
lowerrisk
higher return
higherrisk
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2. Market r
risk
return
rf
SML
βem
rem
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2. Market r
risk
return
rf
SML
βi
rei
ifemfei rrrr
CAPM
i
fei rr
risk-to-reward ratio
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risk
return
rf
Is this true?
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2. Market rIs this true?
Efficient Market Hypothesis• prices already reflect all known info
measure collective belief of all investors
• new info unknowable random
• when new info comes prices adjust
» quickly
» correctly if investors over-react or under-react
» they do so randomly
new info research news
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2. Market rIs this true?
Efficient Market Hypothesis• can only be true if
investors
» have diversified portfolios
» want highest return for lowest risk
» incorrect predictions are random market is
» transparent
» free
» unlimited
Is this almost true?
Is this true enough?
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2. Market rIf
Efficient Market Hypothesis is true• DOESN’T MEAN
can’t make money in stock market
• DOES MEAN no “abnormal” or “excess” returns return proportional to risk NPV of all market investments = 0 research (a.k.a. info)
» useful to match market
» can’t be used to beat market
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2. Market r
Efficient Market Hypothesis flavours• weak form efficient
all past price behaviour included
• semi-strong form efficient weak form + all public info included
• strong form efficient semi-strong + all private info included too
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• Weak Form Efficiency
prices reflect all past market info• price & volume
if true• trading on market info not useful
• technical analysis not useful
• market timing not useful
• some investment advice is
empirical evidence• generally confirmed?
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• Semi-strong Form Efficiency
prices reflect all public info• trading info
• annual reports
• press releases, etc.
if true • value-investing not useful
• other investment advice may be useful
empirical evidence• some, but not all
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• Strong Form Efficiency
prices reflect all info• public & private
if true• then info not valuable
• then no advantage to insider trading
empirical evidence • nope
• insiders can earn abnormal returns
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Risk
0
2
4
6
-25 -15 -5 5 15 25 35 45
% return
# years
risk = volatility = surprise
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2. Market rreturn
rf
SML
βi
rei
ifemfei rrrr
CAPM
i
fei rr
risk-to-reward ratio
risk
volatility
unpredictability
“swing”
β
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Riskrisk = volatility = surprise
return
time
β = 1
β > 1
ifemfei βrrrr
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β
sensitivity to market swings unpredictability riskiness
in a rational market investors should be rewarded more for buying
more volatile stocks
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Market Reward for Riskrisk = volatility = surprise
risk =
surprises affecting the whole market
surprises affecting only one stock(or small group of stocks)
eliminated by diversifying
market will NOT reward you for this
+ unsystematic risksystematic risk
β
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Market Reward for Risk
price
revenuesreturn
%.$
.$10
0020
002
risk
return
rf
Security Market Line
β=1
rem
What happens to stocks that are “out of line”?
%.$
.$20
0010
002
%.$
.$5
0010
500
%10$10.00
$1.00
%.$
.$10
005
500
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Portfolios
changing hats let’s pretend we’re a financial planner
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Portfolios
a collection of stocks mix of
• high risk
• med risk
• low risk
all• publicly traded
• known β s
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Portfolios
yx
20%25%
reyrex
What will our portfolio’s return be?only 2 stocks
50%50%weight
eyyexxep rwrwr
20.50.25.50. epr
225.epr 22.5%
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Portfolios
yx
50%
50%
chance
10%70%+ good year
30%-20%- bad year
20%25%average
reyrex
What will out portfolio’s return be?only 2 stocks
50%50%weight
eyyexxeyyexxep rwcrwcrwcrwcr
225.0epr
22212211 ebebeaeaep rwcrwcrwcrwcr
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Portfolio Volatility
yx
50%
50%
chance
10%70%+ good year
30%-20%- bad year
20%25%average
reyrex
What’s the Standard Deviation of each stock?
50%50%weight
22
exexexexx rrcrrcσ 22
eyeyeyeyy rrcrrc
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Pause?
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Ch 13 Q 4
have $10,000
2 stocks
How much of each stock to earn 12.2%
05.0
032.0xw
stock earns
X 14%
Y 9%
eyyexxep rwrwr
09.014.0122.0 yx ww
09.0114.0122.0 xx ww
09.009.014.0122.0 xx ww
09.014.009.0122.0 xx ww
05.0032.0 xw
64.0xw
)000,10($64.0xv
400,6$xv
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Ch 13 Q 13
4 stocks
What is of portfolio?
stock weight Q 25% 0.60
R 20% 1.70
S 15% 1.15
T 40% 1.34
TTSSRRQQp wwww
34.135.015.115.070.120.060.025.0 p
20.1p
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Ch 13 Q 14
3 investments
What is 2?
investments weight stock 1 v1 1/3 1.9
stock 2 v2 1/3 ?
risk-free v3 1/3
portfolio:
332211 wwwp
03
1
3
190.1
3
100.1 2
10.12
33
90.100.1 2
290.100.3
90.100.32 0.0
1.0
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Ch 13 Q 20asset expected retun betaw 17% 1.4rf rate 4