Market valuation is not ALWAYS correct. Again, "Market Equilibrium" is a theoretical concept which is correct more often than not for MOST equties, but not ALWAYS. When the condition is ignorance and the market does not have information, the equity will NOT be priced correctly. Now, what someone is willing to pay is quite the different story, and that is affected by momentum and percieved value.
Do not make the assumption that because a textbook tells you how the market should function, that it functions that way. I don't know how old you are but to suggest that "Blogging" will do the trick, is silly. Your experience in the market is directly related to your age and if you believe that the market "has it's head on straight" - ALWAYS, well then you need a few more years experience to learn that there are technology and people that can move the market and sometimes you will never know why (Examples: Flash Crash, Hackers, and political events to name a few).
Equities can be FORCED down. Events that the market is unaware of can not be "priced" in, and therefore the "price" of the equity can be undervalued. Also, simply because the market doesn't "know" or is unwilling to price "fair value" does not mean that the market is ALWAYS correct. Do not give to much worth to market forces that you may not readily understand.
I know people who can move a stock with a phone call. Never underestimate the human power to manipulate forces so that things look "normal" when in actuality they were planned to occur exactly as they have. That said, apologies are not necessary as this is just a discussion. Have a good day!
News 
Market Data 
Discover 
