Very few professional investors would advocate a portfolio of
equities without insisting diversification. It is certainly a worthy
aim, but what is puzzling is that so few seem to understand it or at
least make the effort to think in non-conventional terms about. In my
humble opinion the conventional and consensus opinion on the subject is
plain wrong and investors with even a rudimentary understanding of the
underlying issues can better generate diversified portfolios.
In this article I will briefly focus on two ideas. The first is the
concept of beta (derived from the modern portfolio theory beloved of
unintentional index hugging fund managers) and the second relates to
mechanical based investment systems. In turn, I’ll share a few thoughts
on what investors might do to better achieve diversification.
Beta in Investing
The concept of beta is wonderful in principle. Theoretically all an
investor has to do is put together a portfolio of stocks whose average
beta works out to one and he/she has a portfolio thaqt approximates
market risk. Bingo he is diversified! Furthermore, when he wants more
risk, he just buys more stocks with a beta more than one. When he wants
less, he just buys stocks with the opposite property.
Unfortunately, it is not that easy. Beta is- by definition- based on
historical data. It tells you what was a high or low beta across
previous market conditions. I’m not saying that this isn’t useful. It
is. If market conditions are the same going forward then the concept of
beta is highly applicable. Alas, markets are not that compliant.
In the last 20 years or so, we have been through a technology boom, a
housing market boom, a banking boom, a commodities boom, a banking
bust, a housing market bust, a boom in emerging market bonds, boom in
Gold, a China housing boom and so it goes on. The fact is that market
conditions constantly change and deluding yourself that you can obviate
the necessity to think about how macro-conditions are evolving by just
relying on some backward looking data like beta, is a recipe for
trouble.
Consider, a stock like
Intel (NASDAQ: INTC) and then look at
Caterpillar (NYSE: CAT).
Yes, during the dotcom boom the former was likely to have been a high
beta stock as the market priced in every ‘Blade Runner’ technological
fantasy whilst Caterpillar would have been a lot less beta. After all,
they just provide machinery to the boring housing, mining and
construction industries. Fast forward a few years into the dotcom
bust/low interest rate era and suddenly housing, mining and anything
China are (literally) hot property and no one wants tech. Guess who is
high beta now?
This sort of example illustrates that beta changes with market
conditions and cannot be relied upon. In a brief aside, I will also note
that fans of Soros’ reflexivity would also point out that self
reinforcing feedback loops also create investment bubbles (i.e. high
beta stocks or sectors) and they can come from origins such as sheer
sentiment or regulatory changes. How anyone can think that these factors
will be expressed in the historical beta of a stock is beyond me.
Ultimately, if the beta moves around with conditions then structuring
a portfolio based on this approach will not lead to diversification
because the portfolio will do the same.
Mechanical Based Strategies Lead to Unintentional Style or Sector Biases
Another instrument of self-delusion is the seductive idea that
investors can achieve diversification by investing based on a set of
mechanical metrics which attempt to capture some sort of attribute or
other. Again, I am not completely decrying this idea because I use such
metrics to quantify stocks and I think they are useful. What I am saying
is that if they are applied without consideration of the
macro-conditions or overall portfolio direction they will lead to an
unintentional style or sector bias.
In plain English –I can use it in occasion, I promise- if a portfolio
is constructed purely using a metric such as , say dividend yield or PE
ratio or Price/Assets etc, it will end up manifesting an unintentional
market view. To give you an example, consider that in 2008 the highest
yielding stocks tended to be banks, insurance companies and house
builders. Guess what happened next? The dividend did not exactly
provide a floor to the share price, especially when it had a tendency to
disappear as earnings collapsed. Investors can look at the stocks like
Citigroup (NYSE: C) as a classic example of this trap.
Another example of a pitfall with this approach can be seen if
investors focus on only investing in say an earnings or cash-flow basis.
This sort of approach has a tendency to immediately disqualify certain
sectors like biotech or oil & gas exploration. No one invests in
Vertex Pharmaceuticals (NASDAQ: VRTX)
or other such stocks because their growth prospects are all about
future cash flows and earnings. If you wait for them, you will be too
late to capture the upside.
Putting these two examples together begs a key question. How can a
portfolio be truly diversified if it overweights one sector and/or it
ignores whole swathes of the market?
An Alternative Approach to Risk Management
I’m going to conclude this article by suggesting another approach.
Namely, to try and actively diversify the profit drivers in a portfolio
and/or select stocks that have upside drivers which are relatively
non-correlated with the macro economy. An example of the former approach
would be to say balance an oil services company (which you think is
undervalued) with say a company that has a high proportion of its fixed
costs in oil or energy. Another example would be to buy a fertilizer
company and balance it out with a food producer.
In other words, what you are trying to do is pseudo-hedge away macro
risks and create a diversified portfolio that isn’t over exposed to
anyone sector of the economy. Of course such an approach requires a lot
of forethought into stock selection, but hey, no one said investing is
easy!
As for the non-aligned approach, I think special situations investors
tend to cross over a lot into this camp. It is all about finding stocks
with almost hidden upside potential. I think an example of this now is
Johnson & Johnson (NYSE: JNJ).
It isn’t the sexiest stock out there but its growth prospects are
mainly about execution. If it sorts out its production difficulties
within consumer products, integrates the Synthes acquisition and
successfully develops sales of its new drug products then the stock
price can appreciate irrespective of the economy.
Investing is more of an art than a science and there is no reason for
fund managers to try and bamboozle private investors with the idea that
they have the secret formula for diversification. They don’t. In truth
it is much more about understanding why stocks move in the way they do
and trying to balance the overlying risk. There is no reason why private
investors can’t do this just as well as institutional investors.