With 27 countries and nearly 450 million people, the European Union (EU) is a unique intergovernmental organization. It has one of the world's largest economies that depends on an internal market with vigorous competition. This book outlines basic principles of EU law including the its history, its institutions, the sources of its law, and the operation of the internal market. It provides an in-depth study of the treaty articles, Court of Justice jurisprudence and secondary legislation that governs competition (antitrust) law.