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A market anomaly (or market inefficiency) is a price and/or rate of return distortion on a financial market that seems to contradict the efficient-market hypothesis, as conceived by Fama (1970) in his seminal paper.
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Why do some anomalies persist while others fade away?
In the stock market, successful companies are the most innovative ones (esp in biotech, tech) so their individual market is new and their individual market has not been arbitraged away by competitors …