Topic F Exercises
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May 1, 2024
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Exercises
Topic F CAPM, Single-Index Model and Multi-Factor Models
Exercises #1 (Slide 9)
CML
(a special case of CAL, see Topic E Slides 21,22,31)
SML (slide 7 of Topic F)
Relevant Risk
Measures total risk - Standard dev.
Measures systematic risk - beta
Horizontal Axis
Standard dev. - Complete portfolio
Beta – individual securities Vertical Axis
Expected return – complete portfolio
Expected return – individual securities Intercept
Rf (risk free rate)
Rf (risk free rate)
Slope
Sharpe ratio – market portfolio Expected market of risk premium Exercise #2 (Slide 11)
You invest $800 in security A with a Beta of 1.4 and $500 in security B with a beta of
0.7. What is the weighted average Beta of the portfolio?
A weight: $800 / ($800 + $500) = $800 / $1,300 = 0.6153 = 61.50%
B weight:
$500 / $1,300 = 0.3846 = 38.46%
Weighted average Beta of the Portfolio:
A weight * A beta + B weight * B beta 0.6153 * 1.4 + 0.3846 * 0.7 0.862 + 0.269 = 1.31
1
Exercise #3 (Slide 17)
Within the context of the CAPM, assume:
Expected Return on the market=12%
Risk-free rate=2%
Expected Return on the ABC stock=16%
Beta on the ABC stock=1.5
(a) What is the ABC stock’s fair expected rate of return according to CAPM?
2% + 1.5 (12% - 2%)
2% + 1.5 * 10% 2% + 15% = 17%
(b) Is the stock underpriced, overpriced or fairly priced? How much is the alpha?
The stock is overpriced because the ABC stock expected return is 16% which is more than 17%.
Alpha: 16% - 17% = -1%
Exercise #4 (Slide 28)
Suppose that the index model for stocks A and B is estimated from R
A
=
3%
+
.7
R
M
+
e
A
R
B
=−
2%
+
1.2
R
M
+
e
B
σ
M
=
20%;
RSquared
A
=
.20
; RSquared
B
=
.12
excess returns with the following results:
2
(a) What is the standard deviation of each stock?
A: .7^2 * .2^2 / .2 = 31.3%
B: 1.2^2 * 0.2^2 / .12 = 69.28%
(b) Break down the variance of each stock to the systematic and firm-specific components.
A Systematic: .7^2 * .2^2 = 0.0196
Unsystemtaic= .0980 - .0196 = 0.0784
B Systemtaic: 1.2^2 * .2^2 = 0.0576
Unsytematic: .4800 – 0.0576 = 0.4224
(c) What are the covariance and correlation between the two stocks?
0.0336 / 31.30% * 69.28% = 0.155 (d) What is the covariance between each stock and the market index? 0.70 * 0.0400 = 0.028
1.20 * 0.0400 = 0.048
Exercise #5 (Slide 34)
(a) Assume that stock market returns do not resemble a single-index structure. An investment fund analyzes 3,000 stocks in order to construct a mean-variance efficient portfolio constrained by 3,000 investments. They will need to calculate (N) 3,000____ expected returns, (N)_3,000__________
variances of returns and __4,498,500______ covariances.
(b) (b)Assume that stock market returns do follow a single-index structure. An investment fund analyzes 3,000 stocks in order to construct a mean-variance efficient portfolio constrained by 3,000 investments. They will need to calculate 3
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(N)_3,000_______ estimates of expected returns and (N)___3,000_____
estimates
of sensitivity coefficients to the market factor (betas). 4
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