Brazil Presidential Election Second Round: Margin of Victory

According to the latest prediction market data for the query “Brazil Presidential Election Second Round: Margin of Victory”, traders have formed a strong consensus.

Currently, Flávio Bolsonaro <4% is dominating the market with an overwhelming 47.5% chance of winning. Flávio Bolsonaro 4-8% follows in second place at 37.5%, while Lula da Silva <4% sits in third with 11.5%. The betting volume for this specific market has already reached $85.9K, reflecting intense industry interest.

To better assess where each potential outcome stands, the market can be segmented into three distinct trading tiers based on implied probability and contract pricing:

🥇 Tier 1: The Dominant Leader

• Flávio Bolsonaro <4% (47.5%): Currently commanding the highest probability, Flávio Bolsonaro <4% is heavily favored by the order book. Traders looking to back this outcome face a “Buy Yes” contract price of 48¢, signaling a high degree of market conviction. This contract alone has generated $16.8K in volume.

🥈 Tier 2: The Primary Challengers

• Flávio Bolsonaro 4-8% (37.5%): Positioned as the most viable alternative, Flávio Bolsonaro 4-8% maintains a 37.5% chance of resolving true. Its “Buy Yes” shares currently trade at 38¢.
• Lula da Silva <4% (11.5%): Sitting in third place with a 11.5% probability, the market shows measured skepticism toward Lula da Silva <4%, treating it as an outside wildcard unless momentum shifts.

🥉 Tier 3: The Long-Tail Options (Combining for ~3.5%)

Beyond the top three choices, a wide field of macro variables and long-shot outcomes are being tracked. While their individual probabilities hover low, they represent crucial hedges for speculative traders:

• Alternative Options: This includes Flávio Bolsonaro 8-12% (3.4%), Flávio Bolsonaro 12%+ (2.4%), and Lula da Silva 4-8% (1%).
• Speculative Volume: Despite low statistical likelihood, certain long-tail contracts like Lula da Silva 8-12% are still attracting notable interest.

The second round of the presidential election is scheduled to take place in Brazil on October 25, 2026.

This market will resolve according to the margin of victory between the top two candidates in the second round of the next Brazil Presidential Election.

For the purpose of this market, the “margin of victory” is defined as the absolute difference between the percentages of valid votes received by the first- and second-place candidates. Percentages of the valid votes received by each candidate will be determined by dividing the total number of valid votes each of the top two candidates receives by the sum of all valid votes cast in the election.

If the reported value falls exactly between two brackets, then this market will resolve to the higher range bracket.

If a candidate other than Flávio Bolsonaro or Luiz Inácio Lula da Silva receives the most valid votes in the second round, or if the top two candidates receive exactly the same number of valid votes, this market will resolve to "Other".

This market will resolve based on the official vote count once the vote count has been made official.

If a recount is initiated before the vote total has been made official, the market will remain open until the recount is completed and the vote is made official.

If the result of this election isn't known definitively by June 30, 2027, 11:59 PM ET, the market will resolve to "Other".

This market will resolve based on the result of the election, as indicated by a consensus of credible reporting. If there is ambiguity, this market will resolve based solely on the official results as reported by the Brazilian government, specifically the Superior Electoral Court (Tribunal Superior Eleitoral, TSE) (e.g., https://dadosabertos.tse.jus.br/).

While human consensus and speculative volume shape the broader prediction market, our quantitative algorithms offer a data-driven counter-perspective. By analyzing fundamental signals, underlying trends and historical distributions, our AI Valuation model calculates an independent “Fair Value” probability for each outcome.

Comparing this Fair Value against the current Trade Value uncovers major disparities — known as the Expected Value (EV) Gap. Contracts with a positive EV Gap represent statistically underpriced outcomes, whereas a negative EV Gap flags a potential market overreaction.

Top AI Alpha & Mispriced Arbitrage Opportunities

Based on the latest data model run, several key contracts stand out with significant deviations:

• The Most Overvalued Outcome Flávio Bolsonaro 4-8% currently trades at 37.5%, but our AI places its Fair Value at just 28.6%. This creates a large negative EV Gap of -8.9%, suggesting the crowd may be overhyping this outcome and driving the premium too high.
• The Best Value Play (Highest EV) Our model identifies Lula da Silva 4-8% as the premium value opportunity on the board. While the market only assigns it a 1% trading probability, our AI’s Fair Value assessment sits at 7.4% — yielding an impressive +6.4% EV Gap.
• Under-the-Radar Dark Horses Other notable discrepancies include Lula da Silva 12%+ (EV Gap: +3%) and Lula da Silva 8-12% (EV Gap: +1.2%). These long-tail opportunities are heavily discounted by the live order books despite stronger statistical backing from our predictive model.