Lets presume that from the beggining, a few traders decided to play around with forecast of future price movements based solely on price. They knew that methods calling changes of variables in the future dependent on the variables already exist after not long. They discovered them in meteorology, predicting earth quakes, rain etc.. . Those forecasters uncovered that it is possible to expect the changes in a factor based on the past states of the factor. Why did those approaches work from the markets ? Its...