What Are Prediction Markets?
A clear, practical introduction to markets that price the likelihood of future events.
Last updated July 9, 2026
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Prediction markets are markets where participants buy and sell event contracts that pay a fixed amount if an event happens. Prices are interpreted as the market’s implied probability that the event will occur.
What it means
In simple terms, a prediction market is a market for bets on future events. Traders buy contracts tied to a specific outcome; each contract pays a fixed amount if the outcome happens and nothing if it does not.
Here's the basic idea: if a contract that pays $1 if Candidate A wins trades at 62¢, the market is saying Candidate A has roughly a 62% chance, according to current buy and sell activity.
Why it matters
The key thing to know is that prediction markets turn dispersed judgments into a single, continuously updated price. That price can be useful when you want a quick read on what many people — including experts and informed amateurs — collectively expect to happen.
- Markets combine information from many people who each bring different knowledge or incentives.
- Prices update in real time as new information arrives.
How it works
- Someone creates a market for a specific question (for example: "Will Country X pass bill Y by date Z?"). The market defines the event and the resolution conditions.
- Traders buy and sell event contracts. A Yes contract — an event contract that pays $1 if the event happens — is the most common example. A No contract would pay $1 if the event does not happen.
- The market price moves as people place orders. Higher demand for Yes contracts raises the price; higher demand for No contracts lowers it.
- When the event is resolved, contracts pay out $1 for the side that occurred and $0 for the other side. Payouts are how the market realizes its predictions.
The mechanics vary by platform. Some markets use continuous order books like traditional exchanges. Others use automated market makers (AMMs) that quote prices based on a funding pool and a formula. The difference matters for execution and fees but not for the idea that price reflects collective judgment.
A simple example
If a Yes contract costs 62¢ and pays $1 if the event happens, buying one contract costs $0.62. If the event happens, the contract pays $1, so the gain before fees is $0.38. If the event does not happen, the contract expires at $0, so the loss is $0.62.
A few extra points about that example: the 62¢ price is often read as a 62% implied probability. It is not a guaranteed probability; it is the market's consensus at that moment. Fees or platform spreads will reduce the realized gain.
Common mistakes
Confusing price with certainty
A market price is an estimate, not a promise. Even a high price (say 95¢) does not mean the outcome is certain; it means most traders currently put a high probability on it.
Treating every market as equally informative
Some markets attract more informed or active traders than others. Thinly traded markets can move on a single large trade and be misleading until more participants set the price.
Ignoring how the question is defined
Resolution rules matter. If a market’s question is vague about timing or conditions, the price is less useful. Always read the event definition before interpreting the price.
Related concepts
Frequently asked questions
How should I read a market price?
Read the price as the market’s implied probability. A 0.62 price is interpreted as about a 62% chance that the event will occur, recognizing that fees and liquidity can affect accuracy.
Can prediction markets be used for forecasting non-political events?
Yes. Prediction markets are used for economics, science results, product launches, elections, and many other event types, as long as the event can be clearly defined and resolved.
Are prediction markets legal?
Rules vary by location and platform. See our dedicated guide on whether prediction markets are legal in the US.
Do higher-volume markets give better predictions?
Often, yes. Higher volume tends to bring more diverse information and narrower spreads, but volume alone is not a guarantee of accuracy.
How are disputes about event outcomes handled?
Platforms publish resolution rules and dispute procedures. Some rely on designated arbiters; others use community votes. Check the market’s resolution process before participating.