Whether or not people bribe – or attempt to bribe – others depends on which country the counterpart comes from. The nationality of the briber, in turn, is barely significant. That is the result of a study conducted with the participation of three researchers at the University of Cologne: Professor Dr Bernd Irlenbusch, member of the Cluster of Excellence ECONtribute and the Center for Social and Economic Behavior (C-SEB), Professor Dr Andreas Glöckner and Dr Angela Rachael Dorrough, also members of C-SEB, as well as scientists at the University of Amsterdam and the Max Planck Institute for Human Development in Berlin. The study was published in the journal Proceedings of the National Academy of Sciences (PNAS).