A portfolio is made up of Stocks A, B, C, and D in the proportion of 20%, 30%, 25%, and 25% respectively. The nondiversifiable risks of the stocks as measured by their betas are 0.4, 1.2, 2.5, and 1.75 for Stock A, B, C, and D respectively. The expected returns of the stocks are 12%, 24%, 30%, and 28% respectively. Measure the beta of the portfolio.
Solution:
The portfolio beta is the summation of the weighted average of each beta.
Where weighted average of each beta is calculated as:
Stock weighted average = Stock proportion * Individual beta
Therefore,
Stock A beta weighted average = 0.20 × 0.4 = 0.08
Stock B beta weighted average = 0.30 × 1.2 = 0.36
Stock C beta weighted average = 0.25 × 2.5 = 0.625
Stock D beta weighted average = 0.25 × 1.75 = 0.4375
The summation of all betas yields the overall portfolio beta:
Portfolio beta = 0.08 + 0.36 + 0.625 + 0.4375
Portfolio beta = 1.5025 = 1.5
Therefore beta of the portfolio = 1.5
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