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Efficient Markets Hypothesis

Efficient Market Hypothesis (EMH) states that it is impossible to "beat the market" because the price reflects all publicly available information on all traded securities

Weak Form EMH

The week form states that all information contained in past price movements is reflected in the price

Semi-Strong Form EMH

The semi-strong from states that all public information about the security is already reflected in the price

Strong Form EMH

The strong form states that all information about the security is already reflected in the price