IT WORKS UNTIL IT DOESN’T

the photo shows a wooden desk with a keyboard, notepad, pen, and balled up pieces of paper

We’re contrarians. We are not satisfied with conventional thinking that portfolio management requires plugging in the right numbers and then following the formula.

It’s not that simple—and it can actually lead investors astray.

Here’s the deal. Modern portfolio theory—one version of the conventional wisdom—uses rigorous statistical models that attempt to quantify volatility and risk in their many forms. The idea is that if you can measure and predict volatility then you can construct a portfolio that has only as much volatility as you desire.

We believe there are a lot of problems with this approach. These models all rely on the assumption that the market will continue to behave rationally. So when the market experiences irrational exuberance, statistical models quickly lose their meaning and begin producing nonsense.

For example, one measure of a stock’s volatility is called its “beta.” The more correlated a stock’s movement is to the broader market, the higher the beta. A high beta stock tends to be a big winner or big loser based on what the market is doing, while a low beta stock generally moves less than the market. A stock can even have a negative beta, where it tends to move the opposite way from the rest of the market!

Under normal circumstances, volatile stocks tend to have a high beta. But when a hot stock gets caught up in a speculative bubble, it can take on a life of its own. A stock on a hot streak that goes up even on days when the market is down will show a lower beta than stocks that follow the market but may still be volatile.

In cases like this, investment managers that are chasing “low beta” may end up with some very volatile holdings in a portfolio that claims to prioritize stability and low market correlation. And investors that are looking to avoid the roller coaster of the stock market may find themselves on an even bigger ride without realizing it.

We believe statistical analysis can be useful, but it cannot compete with timeless investment principles. Trying to quantify volatility exposure can lead to ugly surprises when the underlying models break down.

We think there’s another way. Instead of trying to mathematically capture and avoid it, we believe in living with volatility. If you are investing for the long haul and you know where your cash flow is coming from, you do not need to fret about day-to-day price action.

Clients, if you have questions about this or anything else, please give us a call.


Content in this material is for general information only and not intended to provide specific advice or recommendations for any individual. All investing involves risk including loss of principal. No strategy assures success or protects against loss.