Key takeaway: Empirical research and historical outcomes consistently demonstrate that prediction markets surpass traditional polling in forecasting electoral results and significant events. Markets synthesise information across many sources and reward accuracy through genuine financial exposure.
With each electoral season comes renewed discussion: do prediction markets or polls deliver superior forecasting? The accumulated evidence points decisively in one direction — prediction markets prevail, and the gap continues to widen. Here is the reasoning, supported by evidence.
The track record
Prediction markets have delivered accurate forecasts in situations where conventional polls faltered or produced misleading signals:
- 2016 US election: Polling aggregates assigned Clinton 70-85% likelihood. Prediction markets (PredictIt, Betfair) valued Trump's chances at 25-35% — substantially nearer to what actually transpired
- 2020 US election: Polling suggested a decisive Biden victory. Markets instead priced a tighter contest, particularly in pivotal states
- 2024 US election: Polymarket's Trump assessment (55-65% probability heading into final week) aligned more closely with actual results than polling consensus that indicated deadlock
- Brexit 2016: Polls indicated near-parity between options. Prediction markets assigned Remain 75% odds — both proved incorrect, though markets recalibrated more swiftly as results emerged
Why markets beat polls
The superiority of prediction markets stems from fundamental design differences, not random chance:
1. Skin in the game
Those answering polls incur no penalty for providing unreliable information. Participants may misrepresent their views (social acceptability concerns), respond thoughtlessly, or decline involvement (participation gaps). Prediction market participants commit actual capital — creating genuine motivation for rigorous, informed decision-making.
2. Information aggregation
Polls pose predetermined questions to selected respondents. Prediction markets welcome participation from anyone prepared to trade — including pollsters themselves, political operatives, quantitative analysts, grassroots observers, and campaign personnel. Market valuations incorporate the complete spectrum of accessible knowledge, transcending mere survey data.
3. Continuous updating
Conventional polls require multiple days to conduct and typically release findings with publication delays. Prediction markets adjust instantaneously as circumstances evolve. When a politician commits a misstep or a public forum alters perceptions, market valuations shift within moments.
4. No methodology bias
Poll reliability hinges substantially on technical choices: demographic adjustment techniques, voter turnout assumptions, question construction. Various polling organisations generate markedly divergent estimates. Markets circumvent these technical considerations entirely — price formation manages the synthesis automatically.
When polls still matter
Prediction markets cannot entirely displace conventional polling:
- Thin markets: Markets with insufficient trading volume face manipulation risks or may simply echo the convictions of dominant participants
- Demographic detail: Polls furnish breakdowns across age cohorts, ethnic backgrounds, geographic areas — markets deliver solely an aggregate likelihood figure
- Public opinion (not outcomes): Polls capture citizen sentiment; markets forecast what shall occur. These represent distinct inquiries
Academic evidence
A 2023 comprehensive review by scholars at MIT and the University of Pennsylvania examined prediction markets relative to polling aggregates across 17 electoral contests spanning six nations. Markets demonstrated superior performance in 15 instances. The advantage proved especially pronounced in races characterised by elevated unpredictability and substantial polling divergence along partisan lines.
Monitor live prediction market valuations on PolyGram's politics page and observe how markets evaluate forthcoming developments as they unfold. Start trading on PolyGram →