Polymarket Misjudged Brazil Election as Lula's 20% Odds Defied Prediction Markets

Prediction markets badly mispriced Brazil's presidential election, with Polymarket placing Luiz Inácio Lula da Silva at roughly 20% odds before he defeated right-wing rival Flávio Bolsonaro in Sunday's runoff to secure a fourth term. The platform had Bolsonaro near 80%. Analysts attributed the miss primarily to Brazil's April ban on prediction market platforms, which pushed pricing to traders outside the country. TxODDS CEO Einar Knobel said liquidity was thin, with the market drawing just 4.5% of the volume seen in the 2024 U.S. presidential election. Finance Minister Dario Durigan said the platforms violated betting regulations and lacked oversight. Pseudonymous Polymarket trader FhantomBets said retail traders opposed to Lula kept "Yes" shares available at 60-80 cents even after he had effectively won. CoinShares researcher Luke Nolan disputed that retail participation was inherently the problem, noting that something priced at 80% does not happen 20% of the time, and cautioned against reading a single upset as systemic failure.