Prices should normally add up to $1 (100% probability) since there will always be one and only one winning outcome in any market. But since the price assigned to each potential outcome is a reflection only of the most recent trade in that contract, the sum of all prices can be higher or lower than $1, especially if there has been rapid change in any one of them.
Modified on: Fri, 2 Feb, 2018 at 3:10 PM
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