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The theory and empirics of false news shocks
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| 538.44 KB | Adobe PDF |
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Resumo(s)
News articles, which pop up pretending to bear valuable information for investors, cause significant changes in stock prices. But occasionally that information turns out to be false. According to Eugene Fama (1965) and his Efficient Market Hypothesis financial markets are efficient if and when new information about the firm fundamentals is instantaneously incorporated in its stock price. In theory, the recall of false news should lead to a reverse of prices to pre-event levels. In reality, the idea of efficient markets faces many challenges. It will be shown that, besides other market anomalies, public attention induces a persistent rise (fall) in share prices, even though clarifying information has already been published.
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Efficient markets Efficient market hypothesis False news shocks Investor behavior