"Taipei Political and Economic Exchange (TPEX)" issues the not-yet-occurred events as stock futures, allows members to predict by transaction, and applies the market price to predict the probability of occurrence of these events. This kind of mechanism which uses crowd wisdom to predict the results of the future events is a new community interaction model, which is distinct from the questionnaire survey method. "Taipei Political and Economic Exchange (TPEX)" does not have to do random sampling, and the accuracy of predictions and the number of participants is also no absolute relationship. Once participants bring their own information into market, market mechanism will be able to integrate the formation to prices effectively, and the market price of each issue can be used as a predictor of crowd wisdom.