Quote from dbphoenix:
You're confusing the value of the company with the value of the stock. Until recently, companies were valued on the basis of their book value and their earnings and their dividends. Then when mutual funds got into the act, growth rates got into it, and these were used to justify extraordinary PE ratios. During the internet boom, there was even something called the "PV", or "price to vision ratio". None of which suggests that the price of the company's stock has anything to do with the value of the company. Again during the internet boom, even CEOs stated quite plainly that the stocks of their companies were ridiculously overpriced.
None of this has anything to do with the subject of the thread, of course. I brought it up only to define the traditional forms of analysis: fundamental (Graham) and technical (Wyckoff, de Villiers, Schabacker, Elliott). But put in another perhaps simpler way, a company is at bottom worth its book value. This becomes most obvious when the price of the stock has dropped so far that it's unlisted.
It is unfortunate that fundamental analysis has become so often corrupted that it acts as a sales tool to justify whatever the analysts have pegged as the value of the stock, but that's less the fault of FA than it is of its practitioners. Those who are investing for the long term would be better served by focusing on the books rather than the latest stock quotes.
Daytraders, of course, or short-term swing traders, needn't concern themselves with any of this.