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How to evaluate stocks? e.g. Whether some stock is cheap or expensive?
duffbeer's answers are reasonable for the specific question asked, but it seems to me the questioner is really wanting to know what stocks should I buy, by asking "do you simply listen to 'experts' and hope they are right?" Basic fundamental analysis techniques like picking stocks with a low PE or high dividend yield are probably unlikely to give returns much above the average market because many other people are applying the same well-known techniques.