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Announcement Effect

   Also found in: Encyclopedia 0.01 sec.
Announcement Effect
A change in security prices or volatility as a result of some announcement. For example, if the Federal Reserve raises interest rates, stock prices are liable to fall. Likewise, if a company announces an acquisition, its stock may rise. The announcement effect may cause drastic price changes; as a result, companies and governments often selectively leak or hint at announcements before they occur to minimize surprises. The announcement effect is also called the signal effect. See also: Price out the News.


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The average announcement effect is significantly more negative for mergers of overconfident CEOs (-90 basis points) than for those of their non-overconfident peers (-12 basis points).
In this article we document a positive announcement effect when a publicly traded company discloses that it has partially or fully frozen its DB plan and replaced it with--or enhanced--the 401(k) defined contribution (DC) plan.
The announcement effect for each firm was computed as the cumulative abnormal return (CAR) for a particular event window around the announcement date.
 
 
 
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