A form of pricing efficiency that profits the price of a security fully reflects all public information (including, but not limited to, historical price and trading patterns). Compare weak-form efficiency and strong-form efficiency.
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Semistrong Form of the Efficient Markets Theory
A controversial model on how markets work. It states that the market efficiently deals with nearly all information on a given security and reflects it in the price immediately. The model holds that technical analysis, fundamental analysis, and any speculative investing based upon them, are useless because any facts that might cause technical or fundamental changes are already reflected in the security price. Investors and academics disagree on how well the model works. See also: Weak form of the EMT, Strong form of the EMT.
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