The season of unreliable polls has started in Brazil

The number of opinion polls has boomed in Brazil over recent years, but allegations of bias and conflicts of interest have muddied the statistical waters ahead of the presidential election

biden 2022 polls president brazil lula bolsonaro
Illustration: Olesia/Shutterstock

Over the past couple of years, Brazil has witnessed a massive surge in the number of institutes publishing electoral polls. For years, the prohibitive costs of conducting in-person interviews across a vast territory created a de facto duopoly between major pollsters Datafolha and Ibope, but their grasp on the segment has been broken by more affordable online and telephone survey methods.

Furthermore, there are more companies venturing into the political arena which are keen on commissioning polls — especially from the financial sector. While some of these surveys have proven to be reliable, editor Euan Marshall showed the negative...

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