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Wikipedia definition
1. Prediction marketPrediction markets (also known as predictive markets, information markets, decision markets, idea futures, event derivatives, or virtual markets) are speculative markets created for the purpose of making predictions. The current market prices can then be interpreted as predictions of the probability of the event or the expected value of the parameter.
Read “Prediction market” on English Wikipedia
Read “予測市場” on Japanese Wikipedia
Read “Prediction market” on DBpedia

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