Betting Markets’ Exaggerated Win

This edition of Over/Under discusses the recent successes and limitations of prediction markets during the midterm elections. These platforms, where users wager on future events, accurately foresaw a Democratic sweep. However, not all their predictions came true, as Democrats were often underestimated. The markets were more useful when they filled information gaps, such as in Alaska and Mississippi, where votes were still being counted.

While prediction markets aimed to aggregate the wisdom of the crowd, they still relied on data from other sources like polls and expert forecasts. The probabilities were often similar to those of forecasting models, and sometimes, the markets got lucky with their predictions. Despite their potential as public tools, prediction markets make up a small fraction of the betting industry, with politics accounting for only 1% of trading volume.