Angry faces back up verbal threats, making them seem more credible

Angry expressions seem to boost the effectiveness of threats without actual aggression, according to research. The findings show that angry expressions lend additional weight to a negotiator's threat to walk away from the table if his or her demands aren't met, leading the other party in the negotiation to offer more money than they otherwise would have.

Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/2...