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In finance, an abnormal return is the difference between the actual return of a security and the expected return.Abnormal returns are sometimes triggered by "events." Events can include mergers, dividend announcements, company earning announcements, interest rate increases, lawsuits, etc. all of which can contribute to an abnormal return.
Additionally, the concept of liquidity is a critical component to capturing "inefficiencies" in tests for abnormal returns. Any test of this proposition faces the joint hypothesis problem, where it is impossible to ever test for market efficiency, since to do so requires the use of a measuring stick against which abnormal returns are compared ...
r it is return to stock i in period t r f is the risk free rate (i.e. the interest rate on treasury bills) r mt is the return to the market portfolio in period t is the stock's alpha, or abnormal return is the stock's beta, or responsiveness to the market return
President-elect Donald Trump and Federal Reserve Chair Jay Powell have clashed before, and there is a chance they could do so again in 2025.
In finance, Jensen's alpha [1] (or Jensen's Performance Index, ex-post alpha) is used to determine the abnormal return of a security or portfolio of securities over the theoretical expected return. It is a version of the standard alpha based on a theoretical performance instead of a market index .
Negative abnormal returns (α): Below-average returns that cannot be explained by below-market risk Security characteristic line (SCL) is a regression line, [ 1 ] plotting performance of a particular security or portfolio against that of the market portfolio at every point in time.
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Similarly, firms that report bad news in earnings tend to have their abnormal security returns drift downwards for a similar period. This phenomenon is called post-announcement drift. This was initially proposed by the information content study of Ray J. Ball & P. Brown, 'An empirical evaluation of accounting income numbers', Journal of ...