What Are Prediction Markets?

The mechanism

A contract pays out a fixed amount — conventionally $1 — if an event happens, and nothing if it does not. If that contract trades at 62 cents, the market is collectively pricing the event at roughly 62%.

Because participants can buy and sell continuously, the price updates as new information arrives. It is a running consensus estimate rather than one analyst's opinion.

Why the price is informative

Anyone who believes the price is wrong has a direct financial incentive to trade against it, which pushes it back toward accuracy. Being right pays; being loud does not. That incentive structure is why prediction market prices have historically tracked outcomes well across elections, economics and sport.

How this differs from a sportsbook

A sportsbook sets a price, takes the other side of your wager, and builds in a margin. A prediction market matches you against another participant and takes a fee on the transaction. The book profits from the spread it sets; the exchange profits from volume regardless of outcome.

That difference shows up in the numbers. Sportsbook odds contain vig that must be removed before they can be read as probabilities. Exchange prices are much closer to a clean probability already.

Common questions

Is a prediction market the same as betting?

The mechanics differ. A sportsbook takes a position against you and prices in a margin; an exchange matches two participants and charges a fee. Regulatory treatment varies by jurisdiction.

What does a price of 62 cents mean?

The market is pricing the event at approximately a 62% chance of occurring.

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