Over value can also mean that people are being stupid in mass.
An example from the pass is look at the dot com bust. Yahoo for example went from $300+ and many experts were saying it was over valued to very quickly dropping to around $100. It was pretty clear Yahoo was massively over valued at the time as it dropped like a rock at the bust.
Bust tend to take out the over value of a market or a company.
Price does not equal value. A $5 stock may be overvalued. A $1000 stock can be undervalued. Investors buy stock based on what they expect the company to earn in the future.
A common ratio in investing is the price/earnings (P/E) ratio. Apple's P/E is around 14. That means that investors are paying $14 for every dollar that Apple earns. Another way of looking at is that if Apple's earnings were to stay the same for the next 14 years, they will have earned an amount equal to today's stock price.
I am interested in knowing what Yahoo!'s earnings multiple was at the time it was trading at $300 per share.
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True, but markets do correct themselves (ie bubble)
While I don't follow stocks for a living, I do follow it leisurely and feel that apple's growth it has been experiencing the past 5-6 years is not sustainable and does not warrant being valued that much higher than other major companies. Call it my common-sense gut check and hence I would never consider buying near this price.
You would say that
How do you define value? Because price does not equal value. In the words of Warren Buffett, price is what you pay and value is what you get.
Explain what you mean by value.