The G7 Summit in Biarritz about a week ago again demonstrated the complexity of international negotiations. Especially in times of egocentric negotiators like Donald Trump and Boris Johnson, the outcome of international meetings between heads of government, on topics from escalating trade conflicts and a hopeless Brexit to climate protections and the Iran deal, can hardly be predicted in advance. All these are sensitive issues and it is essential to develop global solutions in these fields. It is not only narcissistic heads of government, however, who often complicate their negotiations on the international stage. Generally put, there are many factors to consider in every type of negotiation when the negotiating partners come from different cultural backgrounds.