Question 12.5: More Geometric Averages Take a look back at Figure 12.4 . Th...
More Geometric Averages Take a look back at Figure 12.4 . There, we showed the value of a $1 investment after 85 years. Use the value for the large-company stock investment to check the geometric average in Table 12.4.
Average Return | ||||
Series | Geometric | Arithmetic | Standard Deviation | |
Large-company stocks | 9.9% | 11.9% | 20.4% | |
Small-company stocks | 12.1 | 16.7 | 32.6 | |
Long-term corporate bonds | 5.9 | 6.2 | 8.3 | |
Long-term government bonds | 5.5 | 5.9 | 9.5 | |
Intermediate-term government bonds | 5.4 | 5.5 | 5.7 | |
U.S. Treasury bills | 3.6 | 3.7 | 3.1 | |
Inflation | 3.0 | 3.1 | 4.2 |
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In Figure 12.4 , the large-company investment grew to $2,982.24 over 85 years. The geometric average return is thus
Geometric average return =2,982.24^{{1}/{85}}-1=.0987, or 9.9\%
This 9.9% is the value shown in Table 12.4 . For practice, check some of the other numbers in Table 12.4 the same way.

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