Monique Pollmann, Marije van Amelsvoort, Marjolijn Antheunis, Debby Damen, Loes Janssen, Emiel Krahmer, Alfons Maes, Juliette Schaafsma, Alexander Schouten & Per van der Wijst A successful direct replication of Van Kleef, G. A., De Dreu, C. K., & Manstead, A. S. (2004). The interpersonal effects of anger and happiness in negotiations. Journal of Personality and Social Psychology, 86(1), 57-76 According to an influential study by Van Kleef, De Dreu and Manstead (2004), people make larger concessions when negotiation with an angry opponent than when negotiating with a happy opponent. It is unclear, however, how robust and strong the effect is. There are conceptual replications with similar effects, but also studies that do not find this effect or a different pattern of results. In an independent direct replication we find almost the same pattern of results as the original study. We conclude that the effect is of medium size and robust. Given the recent ‘replicationcrisis’, it is positive that we are able to replicate this study that had a large impact on the field of negotiation. Keywords: replication, emotion, negotiation, social influence, social contagion