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Unformatted text preview: UNIVERSITY OF TORONTO Joseph L. Rotman School of Management RSM332 PROBLEM SET #2 SOLUTIONS 1. (a) Expected returns are: E [ R A ] = 0 . 3 . 07 + 0 . 4 . 06 + 0 . 3 ( . 08) = 0 . 021 = 2 . 1% , E [ R B ] = 0 . 3 . 14 + 0 . 4 ( . 04) + 0 . 3 . 08 = 0 . 05 = 5% . Variances are: 2 A = 0 . 3 (0 . 07) 2 + 0 . 4 (0 . 06) 2 + 0 . 3 (0 . 08) 2 (0 . 021) 2 = 0 . 004389 , 2 B = 0 . 3 (0 . 14) 2 + 0 . 4 (0 . 04) 2 + 0 . 3 (0 . 08) 2 (0 . 05) 2 = 0 . 00594 . Standard deviations are: A = . 004389 = 6 . 625% , B = . 00594 = 7 . 707% . Covariance is: AB = 0 . 3 . 07 . 14 + 0 . 4 . 06 ( . 04) + 0 . 3 ( . 08) . 08 . 021 . 05 = . 00099 . Correlation is: AB = AB A B = . 00099 . 06625 . 07707 = . 19389 . (b) We can use the following first order condition to figure out the weights of assets A and B in the market portfolio: E [ R A ] R F AM = E [ R B ] R F BM E [ R A ] R F w A 2 A + (1 w A ) AB = E [ R B ] R F w A AB + (1 w A ) 2 B . 021 . 02 w A . 004389 + (1 w A ) ( . 00099) = . 05 . 02 w A ( . 00099) + (1 w A )0 . 00594 . 1 This can be solved to obtain w A = 0 . 2118 and thus w B = 1 w A = 0 . 7882. Expected return and standard deviation of the market portfolio are: E [ R M ] = 0 . 2118 . 021 + 0 . 7882 . 05 = 0 . 04386 = 4 . 386% M = . 2118 2 . 004389 + 0 . 7882 2 . 00594 2 . 2118 . 7882 . 00099 = 0 . 05964 = 5 . 964% (c) Betas of stock A and B can be found from the CAPM equation (or alternatively you can calculate AM and BM and use the definition of beta): . 021 = 0 . 02 + A (0 . 04386 . 02) . 05 = 0 . 02 + B (0 . 04386 . 02) Solving this gives A = 0 . 042 and B = 1 . 257. The portfolio this investor wants to create has to have a beta of 1 . 5: 1 . 5 = w A . 042 + (1 w A ) 1 . 257 Solving this gives w A = . 2 and thus w B = 1 . 2. So the investor needs to shortsell $200 of asset A and invest the $1,200 in asset B . The expected return on this portfolio is E [ R p ] = R F + p ( E [ R M ] R F ) = 0 . 02 + 1 . 5 (0 . 04386 . 02) = 0 . 0558, or E [ R p ] = w A E [ R A ] + w B E [ R B ] = . 2 . 021 + 1 . 2 . 05 = 0 . 0558 . (d) There will now be two tangency portfolios: the first one (lets call it T b ) will be the one we calculated in part (b) above using the riskfree borrowing rate. Recall that this portfolio has w b A = 0 . 2118, w b B = 0 . 7882, E [ R T b ] = 4 . 386% and T b = 5 . 964%. The second one ( T l ) will be at the tangency portfolio using the riskfree lending rate. We can calculate its expected return and standard deviation as we did in part (b) to get: w l A = 0 . 3955, w l B = 0 . 6045, E [ R T l...
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 Fall '08
 RAYMONDKAN

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