Values change due to a wide variety of factors (including corruption, quality of management, profits, etc.) The first to perceive those changes are the ones who appear to give the market direction based on their willingnes to take risk based on their willingness to predict the (future) value.
If you wish to say the market is wrong because it can't at any one time be at every price that a stock may have during the course of it's lifetime, then I guess your right in an abstract sort of way.
But to say that it is now at the wrong price requires some assumptions on your part. I imagine that you are acting on those assumptions.
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