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Stocks have two components, a short term component and a long term component.  The long term component is essentially exponential growth based on the company's long term performance.  The short term component is often modeled by a random walk, because it is based on the behavior of daily trading.

Warren Buffet tends to focus on the exponential growth part.  He finds a company that is managed well, tries to buy at a low price and then just lets it grow without fooling with the day to day fluxuations.  I know some investors try to invest based on daily trading behavior, but I really don't know how you could read the minds of other people.  That seems like the sort of thing that could drive a person nuts.  Seems better to invest based on how you think the company will perform and try not to let the daily fluxuations trouble you too much.