Hello. I have been developing systems to forecast next day price changes on financial instruments such as forex pairs, stocks, indexes, commodities and so on. Since I have not developed a detailed strategy, I have a question maybe somebody might be able to answer. If you could predict successfully 75% of the times if next day's close price was going to be above or below current day's close price; could you make a profitable strategy? Would it be enough? If not, which level of accuracy would you need for it?