Editing Abnormal return (section)

In [[finance]], an '''abnormal return''' is the difference between the actual [[Rate of return|return]] of a [[Security (finance)|security]] and the [[expected return]]. Abnormal returns are sometimes triggered by "events." Events can include [[Mergers and acquisitions|merger]]s, [[dividend]] announcements, company earning announcements, interest rate increases, [[lawsuit]]s, etc. all of which can contribute to an abnormal return. Events in finance can typically be classified as information or occurrences that have not already been priced by the [[Financial market|market]].