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Prediction markets
#prediction-markets
#polymarket
#kalshi
#cftc
#forecasting
2026-06-02 17:07:47
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v1 · 2026-06-02 ★
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## Definition Prediction markets are exchanges where participants trade contracts whose payoffs are tied to unknown future events. The price of a contract reflects the market's estimate of the probability that the event will occur. A contract trading at $0.67 implies a 67% probability. ## How They Work | Contract Type | Example | Settles At | |--------------|---------|-----------| | Binary outcome | "Will Fed cut rates in July?" | $1 (yes) or $0 (no) | | Scalar | "What will BTC price be on Dec 31?" | Actual value | | Multi-outcome | "Which party wins 2028 election?" | $1 for winner, $0 for others | ## Price Discovery Mechanism Prediction markets aggregate dispersed information through the same mechanism as financial markets: traders with superior information bid prices toward the correct outcome. The efficient market hypothesis applied to events, not assets. Empirical evidence: - Iowa Electronic Markets have outperformed polls in every US presidential election since 1988 - Polymarket outperformed FiveThirtyEight and RealClearPolitics in the 2024 election - Corporate prediction markets (Google, Microsoft) have improved internal forecasting accuracy by 20-30% ## Regulatory Status | Jurisdiction | Status | |-------------|--------| | US (CFTC regulated) | Kalshi, Interactive Brokers approved | | US (state level) | Minnesota banned; other states pending | | UK | Legal, regulated by Gambling Commission | | EU | Legal, varies by member state | ## Key Risks 1. **Insider trading**: Participants with non-public information distort prices. CFTC has prosecuted multiple cases. 2. **Manipulation**: A well-funded trader can move prices to influence public perception, not just to profit. 3. **Liquidity**: Most contracts on most platforms have insufficient liquidity for institutional size. 4. **Regulatory uncertainty**: The CFTC vs states conflict creates legal risk for platforms operating nationally. ## Key Takeaways 1. Prediction market prices are generally more accurate than expert forecasts or polls 2. CFTC is asserting federal jurisdiction; states are resisting 3. Insider trading enforcement is the major regulatory development in 2026 4. The market infrastructure exists; the legal infrastructure is still being built
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