Prediction Market

A marketplace where participants trade contracts that pay out based on the outcome of a future event, with prices interpreted as implied probabilities.

Definition

A Prediction Market lets people buy and sell contracts tied to a yes/no or multi-outcome future event, such as elections, economic figures, sports or awards, where a correct contract typically settles at a fixed value and a wrong one at zero, so the trading price reflects the market's implied probability. Unlike a bookmaker with fixed odds, prices are set by supply and demand, and the platform earns from fees or spreads rather than a classic overround, though that still makes participation net-negative after costs for the average trader. The regulatory status is complex and contested: some venues operate as licensed exchanges or under event-contract rules, others as gambling, and others in a grey area, with treatment differing sharply by jurisdiction. Prediction markets can aggregate information usefully, but for individuals they remain speculative and carry real loss risk.

Worked example

A contract paying one unit if a named event happens, and zero if not, trades at 0.60; a trader who buys and is proved right gains 0.40 per contract, minus fees.

Why it matters

Prediction markets straddle finance and betting and are a live regulatory frontier; learners see prices as probabilities, professionals track the exchange-versus-gambling classification.

Related

Note: Whether a given prediction market is regulated as an exchange, an event-contract venue, or gambling varies by jurisdiction and is actively contested; this entry describes the general model only.