market fluctuations

The Trouble with Zig and Zag Theory

© Can Stock Photo / chokniti

The idea behind massive diversification, owing a bit of everything, is that some things zig when others zag, keeping the whole bucket steadier. Great theory.

The problem is that things do not zig and zag ALL the time. When the big downturn comes, they all go down together. Oh, some things do not go down – but those things also tend to never go up, either.

The mathematical basis for massive diversification is Modern Portfolio Theory. It depends on different types of assets behaving more or less independently of one another – zigging and zagging. The lack of correlation is what drives the hypothetical usefulness of the theory.

In the big downturns, however, the correlations may converge. In plain language, in times of market stress, even independent investments may act as though they are related. The theory may not work due to systematic risks.

This is a real problem, because it is a theory that sometimes has the potential to drive investors to diversify into sectors and asset classes which may hold unknown risks, in the interest of avoiding market volatility.

This only makes sense if one defines volatility as risk, something to always be minimized and avoided. We think it makes more sense to understand volatility as an integral and necessary part of long term investing, a feature to be tolerated (or embraced) as the price of pursuing market returns over the long haul.

Investing in fluctuating markets with confidence requires us to know where our needed cash will come from – only long term money should be invested for the long term.

Clients, if you would like to talk about this or anything else, please email us or call.


The opinions voiced in this material are for general information only and are not intended to provide specific advice or recommendations for any individual.