The Efficient Market Hypothesis (EMH), developed by economist Eugene Fama in the 1960s, proposes that financial market prices fully and instantaneously reflect all available information — making it impossible to consistently achieve returns above the market average through any form of analysis, since any discoverable advantage is immediately priced in by the collective intelligence of market participants. EMH is presented in three forms: Weak form (prices reflect all historical price and volume data — technical analysis cannot generate consistent alpha), Semi-strong form (prices reflect all publicly available information including financial statements and news — fundamental analysis cannot generate consistent alpha), and Strong form (prices reflect all information including insider knowledge — even privileged information cannot consistently generate abnormal returns). In the context of Indian equity markets, EMH is an important theoretical framework but faces empirical challenges — persistent anomalies such as the small-cap premium, momentum effect, and value factor suggest that Indian markets, particularly in the mid and small-cap segments, are not fully efficient, providing informed active managers with opportunities to generate genuine alpha through rigorous fundamental and quantitative research.
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