Dollar surges 8.2% in Brazil's biggest market shock since floating exchange rate adoption.

Lula's reelection to an unprecedented fourth term has produced the largest disruption in Brazilian markets since the adoption of the floating exchange rate regime — and two days later, the country still does not know who will manage its public finances at one of the most fiscally stressed moments of its recent history.

On Monday (26), the dollar recorded its largest daily appreciation since January 1999, surging 8.2% to R$5.60 in a session that triggered B3's circuit breaker for the first time since the pandemic. The Ibovespa fell 13.88%, dragging entire fortunes with it: the country's wealthiest bankers lost roughly US$10 billion in market value within a few hours. The EWZ, the Brazilian equities ETF traded in the United States, plunged 19.8% — an 8.4 standard deviation move that analysts at The Kobeissi Letter described as statistically close to impossible, with a probability of occurrence of 1 in 58 quadrillion under a normal distribution. Tuesday brought some technical relief: the dollar retreated to around R$5.35, future rates partially eased, and the Ibovespa closed with a more modest 0.51% decline. But the recovery was incomplete, and the fundamentals that drove the panic remain intact.

The central problem is the combination of acute fiscal uncertainty and a leadership vacuum at the Finance Ministry. The financial market, through voices such as Citigroup, BCA Research, Morgan Stanley and Bradesco BBI — all of which have downgraded their recommendations on Brazilian assets — is demanding an immediate credibility shock: a credible name for the Finance Ministry, followed by a consistent spending-restraint package. Instead, the Minister of the Secretariat of Institutional Relations, José Guimarães, publicly stated that fiscal adjustment "is not under discussion and is not a priority until the end of the year." The remark landed badly. BTG Pactual, in a report published before the election results, projects that long-term real interest rates could exceed 8% in the absence of a credible fiscal anchor — a level that, if confirmed, would make the current Focus survey, which points to a Selic rate of 12% by the end of 2027, excessively optimistic.

The most frequently cited name for the Finance Ministry is Rafael Fonteles, governor of Piauí and a close ally of Lula, who during his state administration implemented a ten-year fiscal rule to contain spending, modeled on the federal framework. His track record as an administrator is presented by PT members as evidence of commitment to budgetary discipline — but the market has yet to buy the argument, in part because Valor Econômico itself reported that the Piauí fiscal model "is at its limit." Gabriel Galípolo, president of the Central Bank, ruled out any consideration for the post and reaffirmed that his term runs through 2028, signaling at least stability in the conduct of monetary policy at a moment when inflation expectations are showing signs of de-anchoring.

The intervention by the National Treasury was the short-term response to the chaos: in the two days following the election, the Treasury repurchased R$31.6 billion in public debt securities — the largest operation of its kind since March of this year, when the war in Iran provoked similar turbulence. Acting Minister Dario Durigan authorized a further round of preemptive buybacks if necessary. Even so, economist Sérgio Goldenstein was blunt in his assessment: "If the fiscal issue is not addressed, buying back would be like mopping up ice."

The week's fiscal contradictions extend beyond ministerial indefinition. Even under market pressure, the government announced the 30-day renewal of the R$2.12-per-liter diesel subsidy — a measure with a potential cost of R$10.5 billion, maintained with Brent crude above US$110. The Chamber of Deputies approved extending the border bonus to new categories of civil servants, raising the benefit from R$91 to R$191 per day starting in 2027. And the Independent Fiscal Institution calculated that the set of electoral measures enacted by the government throughout 2026 totals R$242 billion in spending and foregone revenue through 2030 — of which R$180 billion in recurring expenditures, equivalent to R$45 billion per year, or roughly one third of the discretionary spending projected in the 2027 Budget. It is in this context that the market reads any signal from the Planalto Palace.

Meanwhile, the real economy is showing its own stresses. The Central Bank reported that household debts with no prospect of repayment reached their highest level since 2012. The PPI — factory-gate inflation — accelerated to 1.54% in September, from 0.34% in August. El Niño threatens to reduce the 2026/27 soybean harvest by up to 10%, to 163.6 million tons, according to a study by Serasa Experian, with direct implications for agribusiness, which already faces pressure from the US tariff hike — the reason the Chamber approved R$270 million in subsidies to sugarcane producers in the Northeast affected by Trump's tariffs. In the Amazon, drought combined with El Niño has begun to affect river freight transport, forcing ships to reduce container loads and shifting demand to air cargo, with rising logistics costs across the production chain.

On the corporate front, Petrobras is a focal point of tension. Its board, meeting on the Monday after the election, pressed for the correction of a gap that reached 127% on diesel and 32% on gasoline relative to international prices. The state-owned company, whose ADRs traded on the NYSE fell on Monday along with the broader market, is expected to announce in early November a 7.32% adjustment in jet fuel for distributors — after an 11.76% increase this month — which, combined with the likely correction in road fuels, will create new inflationary pressure. The CVM, for its part, closed a 20-year proceeding by convicting former director Nestor Cerveró of fraud in the purchase of the Pasadena refinery in the US, imposing a R$16.1 million fine and 15 years of disqualification; Dilma Rousseff and ten other former administrators were acquitted by statute of limitations.

In a dissonant note against the capital flight, Rajiv Jain, co-founder of GQG Partners and the largest private shareholder of Petrobras, signaled that he intends to buy Brazilian assets during the panic, arguing that valuations, earnings and dividend yields remain attractive. Advent raised US$30 billion in its most recent set of funds and maintains a declared appetite for acquisitions in Brazil. These are voices against the consensus — but voices that have historically anticipated inflection points.

What to watch in the coming weeks: the speed and quality of the name chosen for the Finance Ministry will be the first and most decisive signal for markets. In parallel, the TCU decides this Wednesday on the reference rate for the CBS under the tax reform, and Aneel will hold a R$8.9 billion transmission auction on Friday that will test the energy sector's appetite for new investments in an environment of rising capital costs. The Fed's decision on US interest rates, also this Wednesday, will complete the external picture. Any further deterioration in the exchange rate before a credible fiscal announcement will amplify pressure on Petrobras to correct prices — and that adjustment, when it comes, will land directly at the pump and in the consumer price index.

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