Dollars problems

In dollars, this downshift in returns since the 1990s means
that a portfolio invested all in stocks would have a 8.5 percent
nominal return, which is Siegel’s 6 percent prediction for the afterinflation
return, with 2.5 percentage points of inflation added
on. It would take eight and a half years for the portfolio to double
in size. At 6.5 percent, including inflation, a much more pessimistic
assumption, the portfolio would take 11 years to double
in size.
That is a portfolio slowdown. Using the 18.5 percent compound
annual total return from 1982 through 1999, that portfolio
invested in stocks would double in size in just over four years.
A 1990s portfolio doubled in less than three years.
Another reason to take more risk is that many investors have
to make do with less. Investor portfolios that were stuffed with
technology and telecommunications stocks have not recovered
from the losses suffered when the bubble popped.