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Berg et al. (2008)
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Empirical study demonstrating prediction market accuracy compared to traditional polling methods, relevant to AI safety for evaluating forecasting approaches and epistemic techniques for existential risk assessment.
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Summary
A study comparing prediction markets to polls across five U.S. Presidential elections found that market predictions were closer to the eventual outcome 74% of the time, particularly when forecasting over 100 days in advance.
Key Points
- •Prediction markets were closer to the actual election outcome 74% of the time
- •Markets significantly outperformed polls when forecasting more than 100 days in advance
- •Traders' financial stake creates strong incentives for accurate predictions
Review
This research examines the effectiveness of prediction markets, specifically the Iowa Electronic Markets (IEM), in forecasting election outcomes compared to traditional polling methods. The study analyzed 964 polls across five Presidential elections from 1988 to 2004, demonstrating that prediction markets provide more accurate forecasts, especially at longer time horizons. The methodology's strength lies in its direct comparison of market predictions to poll results, without complex statistical adjustments. The authors argue that prediction markets are superior due to several key factors: traders must invest real money, which incentivizes accurate predictions; the market aggregates diverse information dynamically; and participants are motivated to gather and process information effectively. The research significantly contributes to understanding alternative forecasting methods, suggesting that market-based predictive approaches can be more reliable than conventional polling techniques, particularly when trying to forecast election outcomes months in advance.
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International Journal of Forecasting
Volume 24, Issue 2, April–June 2008, Pages 285-300
Prediction market accuracy in the long run
Author links open overlay panelJoyce E.Berga
Forrest D.NelsonbThomas A.Rietzc
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https://doi.org/10.1016/j.ijforecast.2008.03.007Get rights and content
Abstract
“Prediction markets” are designed specifically to forecast events such as elections. Though election prediction markets have been being conducted for almost twenty years, to date nearly all of the evidence on efficiency compares election eve forecasts with final pre-election polls and actual outcomes. Here, we present evidence that prediction markets outperform polls for longer horizons. We gather national polls for the 1988 through 2004 U.S. Presidential elections and ask whether either the poll or a contemporaneous Iowa Electronic Markets vote-share market prediction is closer to the eventual outcome for the two-major-party vote split. We compare market predictions to 964 polls over the five Presidential elections since 1988. The market is closer to the eventual outcome 74% of the time. Further, the market significantly outperforms the polls in every election when forecasting more than 100 days in advance.
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