The aim of this study is to systematise and assess the legal techniques and rules set out by the European Community to create and regulate the internal market in investment services.To dismantle barriers obstructing the construction of a properly integrated market in investment services, and to promote the efficient functioning of such a market, EC law relies on various and complementary legal techniques, which include: negative and positive harmonisation of Member States' laws, vertical (EC/Member States) and horizontal (Member State/Member State) allocation of regulatory and supervisory responsibilities, and cooperation between authorities.In order to understand and evaluate such legal instruments, this book undertakes a systematic examination of the most important sets of EC law rules for the creation and regulation of the single market in investment services. By adopting a functional approach, the study covers all the various fields of law - administrative, commercial, contract, procedural, private international law, etc. - to which these rules belong.The EC rules relevant to the investment services market have a variety of sources: the EC Treaty, the 2004/39/EC Markets in Financial Instrument Directive (MiFID) and its Level 2 implementing measures; CESR's measures at Level 3; the 2000/31/EC Electronic Commerce Directive; the 2002/65/EC Distance Marketing of Financial Services to Consumers Directive; the Rome I Regulation; the 44/2001 Brussels Regulation etc. This book pays particular attention to the interplay between these different sets of rules, and to its impact on the internal market related goals.