Introduction
The internal market of the European Union rests upon the free movement of goods as one of its foundational freedoms, enshrined primarily in Articles 34 and 36 of the Treaty on the Functioning of the European Union (TFEU). Member States retain competence to pursue legitimate public interests through regulatory measures, yet such measures must satisfy the requirements of justification and proportionality as developed through the case law of the Court of Justice of the European Union (CJEU). This essay examines the extent to which the Court’s approach affords Member States sufficient regulatory space. It considers the scope of Article 36 TFEU derogations, the evolution of mandatory requirements, and the application of the proportionality test. The analysis draws on key authorities to evaluate whether the balance struck by the Court adequately accommodates national concerns while preserving market integration.
The Treaty Framework and Article 36 TFEU Derogations
Article 34 TFEU prohibits quantitative restrictions on imports and measures having equivalent effect. Article 36 TFEU provides an exhaustive list of grounds upon which Member States may justify such restrictions, including public morality, public policy, public security, the protection of health and life of humans, animals or plants, and the protection of industrial and commercial property. These grounds are interpreted strictly, as confirmed in early authorities such as Case 8/74 Procureur du Roi v Dassonville. The Court has consistently required that any measure falling within Article 36 must be necessary to achieve the stated objective and must not constitute arbitrary discrimination or a disguised restriction on trade.
The exhaustive nature of Article 36 limits Member States to the enumerated grounds. This approach ensures uniform application across the Union yet constrains national regulators when novel public-interest concerns arise that fall outside the listed categories. Consequently, Member States have occasionally sought to rely on broader justifications developed judicially, as discussed in the following section.
Mandatory Requirements and the Extension of Justifications
In Case 120/78 Rewe-Zentral AG v Bundesmonopolverwaltung für Branntwein (Cassis de Dijon), the Court introduced the concept of mandatory requirements. These non-exhaustive grounds, such as consumer protection, environmental protection and fairness of commercial transactions, permit Member States to justify indistinctly applicable measures that would otherwise breach Article 34 TFEU. The Cassis doctrine therefore expands the range of legitimate public interests beyond the strict confines of Article 36.
Subsequent jurisprudence refined the conditions under which mandatory requirements may be invoked. Measures must apply without discrimination and must satisfy the proportionality test. In Joined Cases C-267/91 and C-268/91 Keck and Mithouard, the Court further narrowed the scope of Article 34 by excluding certain selling arrangements from its reach, thereby indirectly enlarging the regulatory autonomy of Member States in areas such as retail regulation. This development illustrates the Court’s willingness to recalibrate the boundary between free movement and national regulatory space.
The Proportionality Test in CJEU Jurisprudence
Proportionality functions as the principal control mechanism ensuring that Member State restrictions do not exceed what is required. The test comprises three limbs: suitability, necessity and proportionality stricto sensu. The CJEU examines whether the measure is appropriate for securing the pursued objective, whether a less restrictive alternative exists, and whether the burden imposed is excessive relative to the benefit obtained.
In practice, the necessity limb receives the most rigorous scrutiny. For instance, the Court has required Member States to demonstrate that no equally effective but less trade-restrictive measure is available. This inquiry frequently leads to findings of incompatibility where national authorities rely on general assertions rather than specific evidence. The approach promotes a high standard of justification yet may leave limited margin for genuine regulatory experimentation by Member States confronting complex social or environmental problems.
Balancing Market Integration and National Regulatory Autonomy
The CJEU’s framework affords Member States a structured route to defend public-interest measures while maintaining the primacy of free movement. The Cassis mandatory-requirements doctrine and the proportionality principle together provide flexibility that Article 36 alone would not permit. Nevertheless, the requirement of strict necessity and the Court’s preference for the least restrictive means can curtail legitimate national choices, particularly in fields characterised by scientific uncertainty or diverse societal values.
Empirical outcomes reveal variation. In some instances, such as certain environmental labelling schemes, Member States have succeeded in upholding measures when supported by detailed evidence. In others, notably health-related product restrictions, the Court has invalidated national rules for insufficient demonstration of necessity. This pattern suggests that the adequacy of regulatory room depends heavily on the quality of justification presented by the Member State rather than on any inherent doctrinal generosity.
Conclusion
The CJEU’s interpretation of justifications and proportionality under the free movement of goods grants Member States a defined but circumscribed opportunity to regulate in pursuit of public interests. While Article 36 TFEU and the Cassis mandatory-requirements doctrine expand the catalogue of recognised aims, the stringent application of the proportionality test ensures that restrictions remain exceptional. The resulting balance supports market integration yet imposes significant evidentiary burdens on national authorities. Consequently, Member States enjoy adequate room only when they can substantiate the necessity and minimal character of their measures with precision and evidence.
References
- Craig, P. and de Búrca, G. (2020) EU Law: Text, Cases, and Materials. 7th edn. Oxford: Oxford University Press.
- Case 8/74 Procureur du Roi v Dassonville [1974] ECR 837.
- Case 120/78 Rewe-Zentral AG v Bundesmonopolverwaltung für Branntwein [1979] ECR 649.
- Joined Cases C-267/91 and C-268/91 Criminal proceedings against Keck and Mithouard [1993] ECR I-6097.
- Consolidated Version of the Treaty on the Functioning of the European Union [2012] OJ C326/47.
