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The Principle of Loyalty in EU Law

Marcus Klamert


The book offers the first treatment in English to provide a thorough examination of the legal duties falling under the principle of loyalty in EU public law. Despite its seemingly innocuous wording, in what is now Article 4 (3) TEU, the principle of sincere cooperation has had a significant impact in deepening the reach of EU law within the Member States. The principle has been central to the development of Union law since the 1960s, and is still being relied on by the European Court of Justice to often-controversial effect. Providing a thorough discussion of the principle of loyalty in EU law ... More

Keywords: European Court of Justice, loyalty, sincere cooperation, fidelity, solidarity, constitutionalization, effectiveness, cohesion, construction

Bibliographic Information

Print publication date: 2014 Print ISBN-13: 9780199683123
Published to Oxford Scholarship Online: April 2014 DOI:10.1093/acprof:oso/9780199683123.001.0001


Affiliations are at time of print publication.

Marcus Klamert, author
Legal Officer, European Commission