Random walk theory holds that short-term and mid-term price movements of a specific stock appear to be random and thus are unpredictable. Using a share price's past movements, for example, is an ...

(Bloomberg) -- When Burton Malkiel published A Random Walk Down Wall Street 50 years ago, he said a blindfolded chimpanzee throwing darts could pick a stock portfolio that would do as well as one ...

An interesting paper making the point that you can too forecast foreign exchange rates. Not, of course, at the hour to hour level where people speculate at leverage of 500:1, but over longer time ...