Investing: Mean Revision
I suspect that a lot of people who
skim blogs like this will probably jump right past this topic, and others may
get a little intimidated just by the boring name “mean revision”. However, understanding this very simple concept
will put you ahead of 99% of the people around you trying to retire with some
dignity.
As I have tried to drill into this
book 100x times, no one knows the future, therefore, no one can have any
special skill in selecting only investments that garner the highest
return. Otherwise, why would they have
more than one investment in their portfolio?
Just buy the one that is going to do the best, everything else is a
waste of money. Mean revision is the
cousin of predicting the future.
Mutual funds, explained elsewhere in
this book, are either set to match an index such as the DJIA or S&P 500,
are industry specific, or are “professionally” managed. That is, the manager does research to find
the “best” stocks and cherry picks only the one’s he or she feels will do the
best. Hundreds, or even thousands of
these funds are opened every year, and most of them close down in a short time
due to under-performance. However, sometimes
these funds actually do well, making a return higher than the index. Of course, this piques the interest of
investors who flock into this over-performing fund. The manager, who now has to invest this
additional money, may or may not do as well with additional selections, or the
selections initially made may not continue performing well.
What happens next is that the fund
begins to under-perform the market. Of
course, all of the people who poured into the fund before leave, chasing their
next fix of supposedly superior returns.
The fund may or may not survive this.
So essentially, mean revision is where
a fund first achieves “alpha” or superior investment returns, followed by lower
than average returns that put the overall average return of the fund to the
average of the market. This is typically
achieved with managers attempting to outperform the market with their special
“skills”.
As normal people with normal jobs, and
(probably at best) 15% of our incomes going to retirement investing, we are not
going to be able to afford a manager who actually can consistently outperform the
market. It would not even be enough if
us normal people could magically hand over our entire lifetime income at birth
to these professionals. In terms of the
stock market, it is best to simply ride the market averages rather than deal
with snake oil salesmen promising the world.
So, what to do when looking at mutual
funds? Look for the funds that have the
broadest investment philosophy. That is,
a fund that invests in all of the biggest stocks, or all of the middle-sized
stocks. From there, look for a fund that
has as little “churn” as possible. That
is, a fund that is not constantly trading in and out of stocks. That costs money and rarely helps the overall
return on investment.
Finally, and
most importantly, look for the lowest fees.
You are at best going to get the same return as the market, so doing so
as cheaply as possible ensures that you keep more of your investment
returns. High fees are nothing to brag
about, and higher fees will not guarantee a higher return. They will only guarantee more of your money
not being invested on your behalf. That
does not help you.