Persuaders who express positive emotions increase the ratio of success at persuasion more than persuaders who do not express their emotions because expressing positive emotions gives a cooperative impression to a partner (Carnevale and Isen, 1986;Forgas, 1998).
expressing negative emotions such as "anger" may wrest a concession from a partner even if the proposal from the persuader is not attractive to the partner, especially when the partner does not have any other options to choose (Sinaceur and Tiedens, 2006).