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The silent adversary — August 2025, when fixed income won without attacking

◦ Written under index methodology v1 (in effect until 15 Jul 2026). The current series is v2 — readings quoted here may differ from those shown today. See the methodology.

Episode

The extreme

The stock market was celebrating. Mood had returned to extreme optimism in a single leap, as if July's truce had never happened. But beneath the festive surface, an entire sector was being demolished in silence — and the culprit never landed a single blow. It was fixed income, paying close to 15% a year to do nothing. In numbers: market mood jumped from 39.0 to 72.3, while the IFIX/IBOV ratio plunged in four weeks with the most violent move across the entire intermarket grid, landing well below its own average. Selic at 15.0% a year, the dollar at R$ 5.45.

What happened next

The demolition did not stop at the close. Three months later, in November 2025, real estate funds were still on the floor — the IFIX/IBOV ratio digging an even deeper trough — while the stock market's mood, stubborn, returned once more to extreme optimism (72.0). The brick would only start to breathe in February 2026, when the ratio finally pulled away from the floor dug in January. They were months of the same plot: the asset whose appeal is yield losing, month after month, to the yield that needs no property at all.

What did not happen

What the defensive reading failed to see was the whole index. The structure was screaming caution — intermarket in moderate risk-off, the domestic regime defensive at 39.0 — and yet anyone who bought the Ibovespa in August reaped 27.9% over six months — more than nine in ten comparable cases had paid. The engine classified that month as a Surprise: the outcome escaped the range where the vast majority of episodes end up. Caution got the brick right and got the breadth wrong. And the Selic, that silent adversary, never retreated — the market rose all the same.

The honest verdict

August's reading was right about the detail and blind to the whole. Real estate funds did indeed lose to fixed income, methodically, month after month. But treating the defensive structure as a ceiling on the index would have cost dearly: the Ibovespa ignored the warning and surged. The basement can give way while the roof climbs — and both can be right at the same time.

Continue reading: The brick against the paper · The Selic at 15% and the euphoria that yields · The premium of refuge — utilities against the Ibovespa →

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Characters: Rates (Selic)