This introduction presents an overview of the key concepts discussed in the subsequent chapters of this book. The book examines an important dimension of multijuralism or legal pluralism, to wit some interactions, in the Canadian context of indigenous law and legal practices with the civil law and the common law as practised in the country. It addresses some of the ways the problems raised by their co-existence with the traditional legal and judicial order. The book describes and analyses the efforts undertaken at the European Union (EU) level to harmonize contract law across member countries. It also discusses the ways in which national legislators may transpose EU directives in the area of consumer protection. The book provides an analysis of some effects of computer-related crimes on the evolution and administration of criminal law. It also briefs the notions of supply and demand which have been at the core of economics for more than two centuries.