the danger with predictive market technology is that the prediction doesnt even need to be right. if google announces a prediction, everyone will believe it, act upon that belief, and drive the market towards the prediction. in this sense the prediction will *become* right. it becomes a self-fulfilling prophecy.
i'd be surprised if google rolled something like this out for the stock market though. too controversial, and too much of a departure from attacking MSFT and YHOO.










