Radar Perene / Archive / science

Utilities and the rest of the market: the relationship that survived the retest

◦ Index methodology v2.2 (working papers with DOI). See the methodology.

Science

Every market has its folklore of pairs: sectors that "move together", asset classes that "hedge each other", gears investors repeat in conversation as if they were physics. When this house submitted a set of such relationships in the Brazilian market to a retest under altered conditions, nearly all of them came apart. One held — and the interesting part is not that it held, but why it held.

The relationship between the utilities sector — electricity, transmission, sanitation — and the defensive behavior of the Brazilian market was the only one, in the set retested in the working paper Brazilian Intramarket Relationships, that remained stable outside the configuration in which it had been observed. The others were properties of the sample cut; this one appears to be a property of the system.

What survived — and why it makes sense that it was this one

The short answer fits in a sentence: the other relationships depended on the market's mood; the utilities one depends on the contract. Companies in the sector operate under long concessions, with regulated and, in most cases, indexed revenue — characteristics any reader can verify in the public composition of the sector listed on B3. Demand for energy and sanitation barely varies with the cycle; these companies' revenue varies even less. When the rest of the market changes its mood, the economic base of these firms hardly moves.

Relationships built on mood dissolve when the mood changes regime. Relationships built on revenue structure change only when the structure changes — and decades-long concessions change slowly. That is the reading hypothesis the finding supports, and it is also its limit: the study records the stability of the association, not a law of nature.

There is a technical vocabulary for this kind of durable bond between series that walk together over the long run even while drifting apart in the short run — it is the territory of cointegration, and the difference between a cointegrated pair and a merely correlated pair is exactly the difference between structure and coincidence. The paper operates on that frontier; the full model and the exact test period are bench work, not article material.

The protocol behind the survivor

The finding is only worth something because of the cemetery around it. The first version of the study upheld more relationships; the second, retested version openly revises what did not hold — and both versions remain preserved in the repository, with an active DOI. In numbers: of the entire set of relationships examined, a single one crossed the retest.

That design is deliberate. A text presenting only the winning relationship would be selling a coin that came up heads without saying how many coins were tossed. The published mortality is what lets the reader calibrate the survivor: it was not chosen — it is what remained after the ruler passed. The larger process is told in Market relationships that do not survive; what matters here is what stayed standing.

What stability does not promise

Stable is not eternal. A relationship anchored in regulated revenue lasts as long as the regulatory design that produces it — tariff reviews, changes in the sector's framework or a deep recomposition of the listed universe can alter it. Nor does the statistical stability of an association say what to do with it: the study describes how the sector behaved relative to the rest of the market, and stops there. Reading any practical implication depends on the context of the reader — and that is the kind of conversation that does not fit in a public article.

It is also worth naming what the finding is not: it is not the discovery that "utilities are defensive" — folklore already said that. What the retest adds is the difference between saying and measuring: of the many things folklore said about the Brazilian market, this was the only one, in the set examined, that remained true when the test conditions changed.

Frequently asked questions

Does the study claim that utilities protect a portfolio?

No. The study records a stable association between the sector and the market's defensive behavior, within a retested set of relationships. A described association is not an allocation guideline — the paper's text and this article remain on descriptive ground.

Why utilities, and not another defensive sector?

The reading hypothesis is the nature of the revenue: long concessions, regulated tariffs, demand that barely responds to the cycle. Other sectors labeled defensive carry more exposure to market mood than the label suggests — and it was precisely that kind of label the retest brought down.

Does the relationship hold forever?

No empirical relationship holds forever. It holds while the structure producing it — the sector's regulatory design — remains recognizable. The house treats the finding as a revocable title, subject to the same ruler that promoted it.

Where can the study be verified?

In the Zenodo repository, under DOI 10.5281/zenodo.21327663, with the versions preserved. The research page gathers the series' working papers.

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Continue the trail: The only index with public weights: why the house opened one formula and not the others →

House reading: today's reading is in the Diário; the patterns that crossed retests, in the Atlas.

Going deeper into this relationship for a specific portfolio or horizon is an exercise the house carries out in conversation, outside the public article.