sentences:  This would imply that all publicly known information about a company, which obviously includes its price history, would already be reflected in the current price of the stock.Accordingly, changes in the stock price reflect release of new information, changes in the market generally, or random movements around the value that reflects the existing information set.Burton Malkiel, in his influential 1973 work A Random Walk Down Wall Street, claimed that stock prices could therefore not be accurately predicted by looking at price history.