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Most prediction markets were built for questions that end in yes or no. Money questions end in a number, and that changes what the market has to do.

Scalar vs binary prediction markets

Binary markets ask which box a number landed in. Somebody drew those boxes, and it decides your whole payout.

How an order book works in a scalar market

Bids, asks, and the gap between them. What the spread costs you, and why one book beats several.