The Style Box Paradox

Zeno’s dichotomy paradox refers to a philosophical conundrum where someone wishing to get from point A to point B must first move halfway before completing the journey. However, since they always have to complete half the journey first, and the half-journeys can go on ad infinitum, the Greek philosopher was forced to conclude that they would never arrive at the destination but would forever be stuck at various halfway points. It’s a great theory, but it just doesn’t make sense in the real world. People get to their intended destination all the time.

In investing, the theoreticians often study portfolios in the context of investment style boxes. Some portfolios are characterized as small cap value while others are classified as large cap growth. Classifying portfolios in this way is helpful in understanding fund performance looking backward over a discreet time period. However, classifying portfolios by style box classification is not particularly helpful while building portfolios. In the real world, bottom up investors shouldn’t care that much what style box the stock falls in. A more helpful way to classify stocks when constructing the portfolio is by industry and sector. At May-Investments, our portfolio building process has always emphasized sector rather than style box classification. We might look for a consumer stock with good earnings growth prospects that sells for a reasonable valuation, but we really don’t care how the stock is classified by the style box methodology.

A recent Fidelity Investments study explains that, “beyond company-specific factors, sector exposure has been the most influential driver of equity market returns.” While passive indexers mimic their marketing masters who repeat ad nauseam the myth that stock selection doesn’t matter and that a static asset allocation makes up 85% of investor return, in reality the studies showed that asset allocation is so important that it shouldn’t be held static, and that stock picking and sector selection actually matter a lot. While these facts inconvenience the passive indexing crowd, that doesn’t change them.

Style box investing, while great for performance attribution, helps little during the portfolio construction process. It’s a great theory, but it just doesn’t make sense in the real world. The Fidelity study notes that managing sector exposure is key because, “of the distinct risk and performance characteristics of the 10 major sectors.” While a specific stock’s style box attributes fluctuate constantly as ever-changing financial characteristics evolve, companies’ sector and industry attributes remain fairly constant. Moreover, these consistent performance drivers have a wider dispersion between the best and worst performing categories. “Equity sectors tend to have significant performance dispersion relative to each other, which is a key attribute for any alpha-seeking equity allocation strategy,” Fidelity observes. In other words, for investors trying to focus their portfolio on the best performing investments, more can be gained by focusing on sectors where the difference between the best and the worst is significantly wider than is the case with styles.

Another key difference is that different sectors have lower correlations to one another. This makes it easier to diversify risk than can be done using a style box orientation. “During the 2000s, the average correlation of sectors versus one another was 0.52, while the same average correlation among style box benchmarks over the same period was 0.76.” The higher the correlation, the higher the risk that all types of styles will rise and (more importantly) fall at the same time. Fidelity goes on to note that portfolios created with equity sectors “are more efficient – providing higher return and lower risk – than those created using style box components.”

Vanguard Fund founder, John Bogle, has made quite a stir lately criticizing the exchange traded fund industry for creating industry specific ETFs and branding the investors who use them as some form of wild speculator. Bogle, of course, made his fame and living off of passive investing. To his credit, he developed a firm based on low-cost investing strategies. To maintain that his approach is the only legitimate strategy is a bit arrogant, however. The lowest price car in the U.S. is the Nissan Versa S Sedan, priced at $12,780. The car comes with a manual transmission, a less fuel efficient engine, 2 wheel drive, bad ground clearance, a hardtop and very few bells and whistles. Are we all fools for not buying the lowest priced car, as Bogleheads suggest? Or are there other reasons to prefer a different way of viewing the world?

Anyone interested in getting a copy of the Fidelity Investment Insights white paper (Equity Sectors: Essential Building Blocks for Portfolio Construction) can e-mail us and we will be glad to forward a copy of the study.

Douglas B. May is President of May-Investments, LLC and author of Investment Heresies.