A forecast is a probability estimate of a future outcome, expressed as a chance rather than a certainty.
Last reviewed 6 December 2025 · Educational, not advice
A forecast states how likely something is, not whether it will definitely happen. A weather forecast that says a seventy percent chance of rain is making a probability claim, and so is a market price that sits at seventy cents on a yes contract. Both say the same kind of thing. The outcome is uncertain, and this is the chance currently attached to it.
In a prediction market the price acts as a live forecast that updates continuously as people trade on new information. It draws on the views of many participants at once, which is why a market price is sometimes described as a crowd forecast. It is still a forecast, never a result.
The single most common error is treating a forecast as a promise. An outcome given an eighty percent chance still fails one time in five, and that is not the forecast being broken. It is the forecast working as intended, because probabilities describe a spread of possible futures rather than a fixed one. A confident forecast can be wrong, and an unlikely outcome can arrive.
Because of this, no single result can tell you whether a forecast was any good. Forecasts are judged by calibration over many cases. A forecaster who is well calibrated should see events they call at seventy percent happen close to seventy percent of the time across a long run of forecasts. This is why we never name a predicted winner. We explain what a price implies and leave the judgement, and the risk, with you.
A contract trades at seventy five cents, implying a market forecast of about a seventy five percent chance. The event then does not happen. Was the forecast wrong?
Not necessarily. A seventy five percent forecast expects the outcome to fail roughly one time in four. A single miss is fully consistent with a good forecast. To judge it you would need many similar calls and check whether events priced near seventy five percent happen about three quarters of the time. One outcome simply cannot settle the question.
Understanding how these markets work does not make trading safe. Prediction markets can lose you money, and a confident price can still be wrong. Stake only what you can afford to lose, never to chase a loss, and never on borrowed money. If it stops feeling like a free choice, step back. In the United States you can call or text the helpline on 1-800-GAMBLER or visit ncpgambling.org.
A contract price acts as a live forecast in probability terms. A price of sixty cents reflects a market implied chance of about sixty percent for that outcome. It is a forecast, not a result, and it moves as new information arrives.
Yes, easily. A forecast is an estimate of probability, not a statement of fact. An outcome given a high chance can still fail to happen, and a low chance can come in. Forecasts are judged over many cases, not by any single result.
By calibration over time. A well calibrated forecaster who says seventy percent should see those events happen roughly seventy percent of the time across many forecasts. One outcome proves little. A track record across many forecasts is what counts.
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