Startup Idea : App to Predict Future

I want an App to Predict the future. Topic is to predict Stock Market will go up by 2000 points in one month. People give reasons why stock Market will go up, also others will agree and disagree, based on all these data algorithm will provide odds of having this prediction becoming true. Features should have: Topic can be anything, based on suggestions, moderator will keep adding predictions. More popular predictions show up first. Search engine for various predictions in the app etc. and more features as you go along.