Keck EU Law stands as a pivotal moment in the jurisprudence of the European Union, shaping how courts assess national rules that influence the sale and marketing of goods across member states. This article unpacks the core ideas behind Keck EU Law, explains the distinction between selling arrangements and product requirements, and considers the ongoing relevance of Keck in both EU jurisprudence and the post-Brexit UK legal landscape. It is written for practitioners, students, and business executives who want a clear, practical understanding of how Keck EU Law operates within the broader framework of the freedom of movement of goods.
Introduction to Keck EU Law
Keck EU Law, named after the landmark case Keck and Mithouard v France (1993) C-267/91, revolutionised the way the European Court of Justice (ECJ) approached national rules that affect the sale of goods. Prior to Keck, many national measures were scrutinised under broad constraints of Articles 28 to 30 (now Articles 34 to 36 TFEU), which prohibit restrictions on the import, export, and goods movement between member states. Keck introduced a more nuanced lens: some national selling rules that apply to all traders in the same manner and serve purely selling arrangements could be treated differently from rules that regulate the content or attributes of products themselves. The result was a functional binary: one set of measures could escape the full force of EU scrutiny if they were truly selling arrangements, while product requirements remained tightly controlled under the prohibitions on obstacles to trade.
The Keck Case: Facts and Context
Facts of Keck and Mithouard
The case involved a French retailer, Keck, who argued that a French law restricting the resale price of goods effectively barred price competition, thereby hindering the free movement of goods. The Supreme Court of France referred questions to the ECJ to determine whether such resale price controls or other selling rules could be treated as selling arrangements or as product requirements that would fall under more rigorous scrutiny under EU law. The ECJ ultimately clarified how to classify national measures and how to assess their compatibility with the internal market rules.
From Cassis de Dijon to Keck: The Legal Landscape
Keck EU Law did not emerge in a vacuum. It built on the foundational Cassis de Dijon (C-120/78), which established that member states could not impose measures having an “undue hindrance” on trade in goods except where objective reasons justified them. Keck refined this framework by asking: when is a national rule a genuine selling arrangement rather than a product requirement? This distinction has both immediate practical consequences for enforcement and enduring theoretical implications for how EU law balances national sovereignty with the integrity of the internal market.
The Keck Test: Selling Arrangements vs Product Requirements
The ECJ laid down criteria to differentiate selling arrangements from product requirements. The core idea is that selling arrangements apply to the marketing or sale of products, and not to the product’s intrinsic characteristics. When a measure is a selling arrangement, its compatibility with EU law is tested differently than that of a product requirement.
Definition of Selling Arrangements
Selling arrangements are rules that relate to how a good is sold, including aspects such as where, when, or how a product can be sold, how advertising is conducted, or what information must be displayed at the point of sale. The emphasis is on the process of marketing and the conditions of sale rather than on the product itself. Importantly, these rules apply to all traders operating within a member state and are not aimed at protecting the consumer from a dangerous or substandard product.
What Qualifies as a Product Requirement?
Product requirements, by contrast, govern the essential characteristics of the product. This includes safety standards, quality criteria, technical specifications, or packaging rules that directly influence what the consumer ultimately buys. Under EU law, product requirements are subject to a stricter prohibition if they have an effect of hindering cross-border trade, unless justified by mandatory requirements such as the protection of health and safety, consumer protection, or other legitimate objectives under Articles 34 and 36 TFEU.
Impact on EU Law and the Internal Market
The Keck framework served to streamline the internal market by providing a clearer route for compliance assessment. By separating selling arrangements from product requirements, national authorities could apply uniform rules for processes of sale without facing the same level of scrutiny as when direct product-related standards were at issue. For businesses, this meant greater predictability in how their marketing strategies would be judged under EU law and, in turn, a more consistent interpretation of what constitutes an obstacle to the free movement of goods across borders.
Criticisms, Nuances, and Developments
Criticisms and Practical Limitations
As with any legal doctrine, the Keck approach has its critics. Some argue that the line between selling arrangements and product requirements can be subtle and context-dependent, leading to inconsistent application across jurisdictions. Others contend that the framework may inadequately account for measures that, while framed as selling arrangements, have a disproportionate and indirect impact on cross-border trade, effectively functioning as disguised product requirements. Critics also point out that the ascent of the internal market has shifted emphasis toward balancing consumer protection with commercial freedom, an equilibrium that Keck does not always neatly resolve.
Refinements and Related Jurisprudence
Over time, the ECJ has refined and clarified the Keck principles in subsequent cases. While Keck remains central, it sits within a broader mosaic of EU law on the free movement of goods. Other cases have addressed nuances such as the extent to which advertising, labelling, and packaging fall within the scope of selling arrangements; how rules targeting a specific sector interact with internal market freedoms; and how national measures designed to protect public health or safety fit within the permissible exceptions to free movement. Reading Keck alongside these authorities provides a more robust toolkit for assessing whether a national rule constitutes a selling arrangement or a product requirement, and what level of justification is required to uphold it under EU law.
Brexit, Keck EU Law and the UK Legal Landscape
Keck in the Context of Retained EU Law
With the United Kingdom’s departure from the European Union, the direct application of Keck EU Law within the UK ceased to be automatic. However, the principles embedded in Keck have informed retained EU law and continue to influence domestic commercial and competition law. Retained EU law preserves many EU-level rules and principles, including aspects of the internal market framework that underpin the free movement of goods. In practice, UK courts may refer to Keck-era reasoning as persuasive, especially when interpreting the balance between selling arrangements and product requirements in the post-Brexit environment.
UK Domestic Perspective
In the UK, national law now governs most aspects of goods movement that were formerly harmonised under EU law. Still, the Keck approach offers a valuable analytical template for courts weighing the legality of national marketing rules. It assists in identifying when a measure is a selling arrangement, thereby enabling a more measured assessment of proportionality, justification, and potential discrimination against cross-border traders. For businesses operating in or with the UK market, the ongoing relevance of Keck EU Law lies in its robust framework for evaluating compliance with the spirit of the internal market, even as the formal legal architecture has diverged post-Brexit.
Practical Guidance for Practitioners and Businesses
Assessment Checklist: Is a Measure a Selling Arrangement?
- Does the rule regulate the marketing or sale of a product rather than its intrinsic characteristics?
- Is the measure applied uniformly to all traders within the jurisdiction?
- Does the rule set conditions on how or where a product is sold (such as display requirements, store layout, or sale methods) without modifying the product itself?
- Would the rule, if framed as a product requirement, directly affect a consumer’s choice or the product’s attributes?
- Is there a justified objective related to public policy (consumer protection, health and safety, or other legitimate aims) that could defend a potential restriction?
- Are there alternative measures that could achieve the same objective with less interference in trade?
Strategic Considerations for Businesses
Businesses operating across borders should map national selling arrangements against the Keck criteria to forecast potential challenges or opportunities. When planning marketing strategies, consider how promotional rules, in-store display standards, or sales timing restrictions might be classified. If a measure appears to be a form of product requirement rather than a selling arrangement, prepare to argue its necessity and proportionality under the stricter scrutiny associated with product-related rules. In the UK context, keep an eye on retained EU law developments and domestic court interpretations that continue to borrow Keck-inspired reasoning when assessing cross-border commercial practices.
Case Studies and Illustrative Scenarios
To bring the theory to life, consider a few practical scenarios where the Keck EU Law framework would come into play. For example, a member state imposes a ban on the sale of certain packaging materials for environmental reasons. If the rule applies equally to all traders and targets the selling process rather than the product’s packaging itself, it can often be treated as a selling arrangement. Conversely, a regulation that mandates packaging materials to meet specific compositional standards would likely resemble a product requirement, triggering stricter EU scrutiny. In another scenario, a country prohibits an in-store promotional event that favours foreign brands. If this rule governs how promotions are conducted rather than the products themselves, it tends toward the selling arrangement category, though proportionality and justification would still be evaluated carefully.
Academic and Practical Debates
Scholars continue to debate the boundaries and effectiveness of the Keck framework. Some argue that the effort to streamline the internal market should prioritise predictable outcomes even if it means accepting some blurring of boundaries between selling arrangements and product requirements. Others insist on a more dynamic approach that recognises evolving marketing strategies — including digital platforms and cross-border e-commerce — as integral to the modern selling environment, requiring a more adaptive application of the Keck approach. The dialogue between theory and practice remains active, with judges and practitioners testing Keck EU Law against contemporary commercial realities.
Conclusion: The Enduring Relevance of Keck EU Law
Keck EU Law endures as a cornerstone concept in the analysis of national measures affecting the free movement of goods. By distinguishing selling arrangements from product requirements, the ECJ provided a practical and influential framework that helped harmonise expectations across the internal market while preserving the ability of member states to regulate commerce in ways consistent with legitimate objectives. Although Brexit reshaped the legal landscape in the United Kingdom, the logic and reasoning of Keck EU Law continue to inform retained EU law and domestic jurisprudence. For businesses, counsel, and scholars alike, Keck remains essential reading for anyone seeking to understand how EU law governs sales channels, marketing practices, and cross-border trade—both in today’s EU context and in the ongoing evolution of the UK’s post-Brexit legal order.