'European Union Internal Market Law provides a clear and detailed exploration of one of the key features of EU law and is a very useful addition to the bookshelves of those studying the topic for the first time or at more advanced level.' Jess Guth, Bradford University Law School 'The EU internal market is the A and Ω of EU law. It is one of the most fascinating yet complex areas of EU law, as it constantly evolves, driven by legislative action produced by the EU political institutions and interpretive judgments of the EU judiciary. Weiss and Kaupa have got their finger on the pulse of the EU internal market's core in a masterful and still surprisingly reader-friendly manner. Leading case-law is intermingled with theoretical and policy analysis, whereas the most important provisions of EU's primary and secondary law are highlighted - all this, in a clear and systematic manner. Additionally, an analytical framework used along the four fundamental freedoms allows rising to the challenge of deciphering the essentials of the EU internal market law. An informative read for scholars and an indispensable tool for any student interested in understanding the essentials of EU's substantive law.' Panagiotis Delimatsis, Tilburg Law and Economics Center (TILEC), Tilburg University