No. 42 · Risk · Economics
Prediction Market
When people must pay for being wrong, their forecasts get sharper.
In the Almanac
“Betting on presidents”, 1884–1940 · “Kalshi”, 2024
Both stories in full, three ways to use it and where it misleads.
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Questions
What is Prediction Market?
A prediction market pays out depending on whether an event happens. If a one-dollar contract trades at sixty cents, the crowd sees about a sixty percent chance. Because wrong traders lose money, prices tend to blend scattered information into useful forecasts.
How do you use Prediction Market?
Borrow the idea: ask your team for anonymous probabilities, put numbers on your own predictions and check them later. Treat market odds as one input, not gospel, since thin markets can be swayed.
When does Prediction Market matter?
Prediction Market is one of the 32 mental models for risk, the situations where you ask: What could go wrong, and what will I do if it does? Within that, it belongs to “Thinking in odds”, alongside Expected Value, Fat-Tailed Distributions and Foxes vs Hedgehogs.
What is an example of Prediction Market?
Two stories show it at work: Betting on presidents (1884–1940) and Kalshi (2024). Both are told in full in The Mental Models Daily Almanac, which has two stories for each of its 365 models.
Which mental models are related to Prediction Market?
Crowdsourcing, Incentives and Super Forecasters. Prediction Market itself comes from economics.