This book presents the substance of the legal rules applicable to business operations from an international perspective. Among a large number of topics, it deals notably with contracts, agency, intellectual property (incl. licensing), security rights (incl. letters of credit) and financial instruments. It also lays down general principles regarding business crimes, non-contractual liabilities, constitutional liberties and procedural rules. Its particularity is an approach starting systematically from international sources, which are today progressively shaping a nearly universal understanding of legal instruments, as regards their substance, and of the legal environment of business. Designed for multinational audiences of students in management and economics, it can also be useful for lawyers interested in an international perspective.