Anger is an emotion often associated with perceived obstruction, unfairness or a harmful action attributed to another agent. Feeling anger, displaying it and acting aggressively are different events. In negotiation experiments, information that a partner was angry could affect concessions, illustrating an interpersonal consequence of a communicated emotion without making anger identical to aggression. [ref]
The interpersonal effects of anger and happiness in negotiations by Gerben A. van Kleef and others. 2004, partner-emotion information and concession behavior
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