Price in One Year
State of Economy Probability Stock A Stock B
Boom .15 115 125
Moderately Growth .65 108 112
Recession .20 92 85
Return in one year | |||
State of economy | Probability | Stock A | Stock B |
Boom | 0.15 | 15% | 25% |
Moderately growth | 0.65 | 8% | 12% |
Recession | 0.20 | -8% | -15% |
a. E(RA) = 0.15(0.15) + 0.65(0.08) + 0.20(-0.08) = 0.0585 = 5.85%
E(RB) = 0.15(0.25) + 0.65(0.12) + 0.20(-0.15) = 0.0855 = 8.55%
Std. Dev. A = (0.15(0.15-0.0585)2 + 0.65(0.08-0.0585)2 + 0.20(-0.08-0.0585)2)1/2 = 0.073435 = 7.3435%
Std. Dev. B = (0.15(0.25-0.0855)2 + 0.65(0.12-0.0855)2 + 0.20(-0.15-0.0855)2)1/2 = 0.126193 = 12.6193%
b. Risk premium on stock A = 5.85% - 2.50% = 3.35%
Risk premium on stock B = 8.55% - 2.50% = 6.05%
Sharpe ratio of A = 3.35% / 7.3435% = 0.4562
Sharpe ratio of B = 6.05% / 12.6193% = 0.4794
Stock B has better risk-reward tradeoff as measured by the Sharpe ratio.
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