1 x. explaining relative price – arbitrage pricing theory
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X. Explaining Relative Price – Arbitrage Pricing Theory
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Assume a two index RGP
1 1 2 2 ... cov( ) 0i i i i i i jR a I I e e e
i i2 Portfolio Expected Return
A 15 1.0 .6 B 14 .5 1.0 C 10 .3 .2
Three points describe a plane
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1 1
2 12
1
But
i
iiP
iP i
iP
X
R X R
X
X
Any weighted average of points on a plane where the weights sum to 1 lie on the plane –any portfolio lies on the plane
Lies above a below – riskless arbitrage
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iMiii eRR
iiiii eIIR ...2211 RGP
iFi BRR
...2211 iiFi BBRR
APT
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What are the ’s?
What are the I’s?
What are the ’s?
ij
j
In general, I’s are systematic influences which have an impact on the return of a large percentage of stocks.
’s are characteristics of individual firms or sensitivities of industrial firms to systematic influences.
’s are the market price of the ’s.
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How to Identify; Five Approaches:
1) Statistical methods for identifying the I’s and ’s simultaneously – factor analysis or principle components analysis.
2) Identify the firm characteristics that are judged as most important – estimate the ’s from multiple regression.
3) Identify the I’s; a priori macro variable.
4) Identify the I’s; a set of portfolios sufficient to capture all influences.
5) Mixtures of the above.
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Identify simultaneously the ’s and the I’s.
Factor Analysis
Let the data speak to the return generating process.
ij
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Conceptually most difficult to understand
Takes return data for each member of a setof securities over time (e.g. monthly returns)and the mathematically determines a set ofIndexes (portfolios) which best explains
returns iCov e 0je
Simple Example 4 stocks (countries) Belgium, Canada, France, U.S. Returrn data – monthly 1979-1988
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C
U
B F1t Bt Ct Ft
Ut
f .67(R R ) .76(R R ) .76(R R )
+ .77(R R )
WHERE 1. R INDICATES RETURN 2. f INDICATES FACTOR VALUE 3. B IS BELGIUM
4. C IS CANADA
5. U IS UNITED STATES
6. F IS FRANCE
7. t IS TIME PERIOD
8. BARS INDICATE MEANS
C2,t Bt Ct
Ut
f .40(R R ) .73(R -R ) .37( )
+ .41(R )
B
U
Ft FR R
R
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FOUR FACTOR MODEL OF THE
JAPANESE ECONOMY
VERSUS ONE FACTOR MARKET INDEX
NRI 400; 20 PORTFOLIOS
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BARRA – MODEL
SIZE
LIQUIDITY
GROWTH
VALUE
FINANCIAL LEVERAGE
INDUSTRY MEMBERSHIP
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M F 1 2 3 4
2
5 M
R -R .0022 1.33I 0.56I 2.29I 0.93I
R 24
(-3.94) (4.96) (1.99) (-2.27)
I (R -
F 1 2 3 4R ) (.0022 1.33I 0.56I 2.29I 0.93I )
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Salomon Brothers Risk Attribute Model
1. Economics Growth = Monthly Changes In Total Industrial Production
2. Credit Quality = Return on High Yield Bonds – Return on Governments (10+Year)
3. Long Term Interest Rates = Yield Change in 30 Year Treasuries
4. Short Term Interest Rates = Yield Change in 3 Month Treasuries
5. Inflation Shock = Realization Inflation – Expected Inflation (CPI)
6. US Dollar = Change in Value of US Dollar Trade Weighted
7. Market (After 6 Factors Removed). S&P
8. Small-Cap Premium = Return Russel 2000 – S&P 500 (seven factors removed)
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PORTFOLIO APPROCH
RETURN ON MUTUAL FUNDS RELATED TO:
1. RETURN ON S&P INDEX
2. RETURN ON SMALL STOCK INDEX
3. RETURN ON BOND INDEX
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FAMA – FRENCH
1. TERM = LONG TERM GOVERNMENT BOND RETURN – T-BILL RATE
2. DEFAULT – LONG TERM CORPORATE BOND RETURN – RETURN ON LONG TERM GOVERNMENT BOND
3. SIZE – RETURN ON PORTFOLIO OF SMALL STOCK -PORTFOLIO OF REGULAR STOCKS
4. BOOK TO MARKET = RETURN ON PORTFOLIO OF HIGH BOOK TO MARKET FIRMS – RETURN ON PORTFOLIO OF LOW BOOL TO MARKET FIRMS
5. RETURN ON MARKET – T-BILL RATE
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NORMAL DURATION
RETURN RELATED TO RETURN ON A MARKET PORTFOLIO
RETURN RELATED TO
1. RETURN ON A 4 YEAR PORTFOLIO OF BONDS (LEVEL OF INTEREST RATE)
2. DIFFERENCE BETWEEN 10 YEAR TREASURY AND 2 YEAH TREASURY (TWIST IN YIELD CURVE)
3. DIFFERENCE BETWEEN 4 YEAR AAA CORPORATE AND 4 YEAH TREASURY (PRICE OF RISK)
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1 1 2 2
1 1
Why Bother
APT and CAPM are not mutually exclusive
If CAPM holds
( )
If APT holds
But if in indexes can be replicated with
portfolios of securities and
CAPM holds
i F M F
i F i i
R R R R
R R
2 2( ) ( )M F M FR R R R
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1 1 2 2
1 1 2 2
( ) ( )
-
( - )
Not Mutually Exclusive
M M
M
M
i F i F i F
i F i i F
i F i F
R R b R R b R R
R R b b R R
R R R R
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Passive Management
1. Better Match an index
2. Match an index + or – certain stocks
3. Passive management with changed sensitivity
a. Pension fund liabilities that go up with inflation will pay a price to have assets that go up with inflation. APT tells investors that the cost of zero inflation exposure is (-4.32x.37) = 1.60% b. Take on oil exposure may be free lunch
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Active Management
1. Make bets e.g. on interest rates or inflation
2. Look for stocks out of equilibrium
3. Long short zero risk portfolios