ANNOUNCEMENT EFFECT

The impact that the market will feel from a news which signals that a change is bound to happen at some future date. It can be taken as a general term for a reaction to any development that will affect trading such as a stock split or change in dividend policy. It is most commonly used, however, to describe the reactions of the investors to alterations in monetary policy, such as a cut or hike in a key interest level.

Also referred to as a "signal effect."