This paper presents the results from a larger study examining the ethical issues surrounding global buyer–supplier relationships which was sponsored by the Center for Advanced Purchasing Studies, the research arm of the National Association of Purchasing Management NAPM . Specifically, the objectives of this paper are to: 1 develop a scale that measures unethical behavior between US purchasing . managers and their non-US suppliers, and 2 examine how differences in perceptions of unethical behavior between US buyers and their non-US suppliers can influence the buyer–supplier relationship.