Price can approximate probability, but do not overread it
If a Yes contract trades at 0.60, people often say the market implies a 60% probability. That is useful shorthand, but not the full truth. The price may reflect market beliefs, but it is not an oracle or a pure probability.
The CFTC’s prediction markets page explains that event contracts sit inside specific rules and regulatory contexts. Product docs such as Polymarket Docs also make clear that market rules, settlement, and trading mechanics matter.
Why price can differ from probability
| Reason | Effect |
|---|---|
| Low liquidity | Small orders can move price |
| Fees | Prices must compensate for trading costs |
| Participant bias | One-sided user bases can skew markets |
| Settlement rules | Real-world outcome may not match contract outcome |
| Time value | Capital is locked until resolution |
| Information asymmetry | Some traders may see information earlier |
When prices are more useful
Prices are more informative when the market has meaningful depth, clear rules, and objective settlement sources. If the market is tiny, wording is ambiguous, or resolution may be disputed, the price is a mixture of belief, emotion, and liquidity pressure.
Check Yourself
Why is a 0.60 Yes price not exactly the same as a true 60% probability?
Suggested answer: Because market prices also reflect liquidity, fees, trader composition, settlement rules, and information asymmetry.
Further reading: CFTC Prediction Markets · Polymarket Docs · Prediction Market
Get the pre-trade checklist.
We are turning these guides into a searchable checklist for checking terms, rules and risk before you trade.