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    Stock Variance

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    The standard deviation of the market index portfolio is 20%. Stock A has a beta 1.5 and residual standard deviation of 30%.

    A) What would make for a larger increase in the stock variance, an increase of 1.5 in its beta or an increase of 3% in its residual standard deviation?

    B) An inventor who currently holds the market index portfolio decides to reduce the portfolio allocation to the market index to 90% and to invest 10% in stock A. which of the changes in A, will have greater impact on the portfolio standard deviation?

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    Calculation of Stock Variance

    Standard deviation of market index portfolio: (?m) = 20% or 0.2
    Beta of stock A: (?) = 1.5
    Residual standard deviation of stock A: (?A) = 30% or 0.3
    Stock variance at current value: Market risk + Diversifiable risk
    Or ?12 = ?2× ?m2+ ?A2 (Daves & Daves, 2012)
    = 1.52×0.22+0.32
    = 2.25×0.04 + 0.09
    =0.18 or 18%

    (A): Change in variance, if residual standard deviation increases by 3%:
    Standard deviation of market index portfolio: (?m) = 20% or 0.2
    Beta of stock A: ...

    Solution Summary

    The expert examines stock variances and standard deviation for market index portfolios.