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《《Investment 8th Chap009》.doc
CHAPTER 9: THE CAPITAL ASSET PRICING MODEL
PROBLEM SETS
1. E(rP) = rf + ? P [E(rM ) – rf ]
18 = 6 + ? P(14 – 6) ( ? P = 12/8 = 1.5
2. If the security’s correlation coefficient with the market portfolio doubles (with all other variables such as variances unchanged), then beta, and therefore the risk premium, will also double. The current risk premium is: 14 – 6 = 8%
The new risk premium would be 16%, and the new discount rate for the security would be: 16 + 6 = 22%
If the stock pays a constant perpetual dividend, then we know from the original data that the dividend (D) must satisfy the equation for the present value of a perpetuity:
Price = Dividend/Discount rate
50 = D/0.14 ( D = 50 ( 0.14 = $7.00
At the new discount rate of 22%, the stock would be worth: $7/0.22 = $31.82
The increase in stock risk has lowered its value by 36.36%.
3. a. False. ? = 0 implies E(r) = rf , not zero.
False. Investors require a risk premium only for bearing systematic (undiversifiable or market) risk. Total volatility includes diversifiable risk.
False. Your portfolio should be invested 75% in the market portfolio and 25% in T-bills. Then:
?P = (0.75 ? 1) + (0.25 ? 0) = 0.75
4. The appropriate discount rate for the project is:
rf + ?[E(rM ) – rf ] = 8 + [1.8 ( (16 – 8)] = 22.4%
Using this discount rate:
Annuity factor (22.4%, 10 years)] = $18.09
The internal rate of return (IRR) for the project is 35.73%. Recall from your introductory finance class that NPV is positive if IRR discount rate (or, equivalently, hurdle rate). The highest value that beta can take before the hurdle rate exceeds the IRR is determined by:
35.73 = 8 + ?(16 – 8) ( ? = 27.73/8 = 3.47
5. a. Call the aggressive stock A and the defensive stock D. Beta is the sensitivity of the stock’s return to the market return, i.e., the change in the stock return per unit change in the market return. Therefore, we compute each stock’s beta by calculating the difference in its return across the two scenarios divided by the differ
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