Research Article

The Principle of Legal Certainty as a Principle of Economic Efficiency

Aurelien Portuese, Orla Gough, Joseph Tanega

GAICIL Insights

Legal certainty is a feature of the rule of law and a precondition for market exchange. The article goes further and argues that the EU principle of legal certainty carries an efficiency rationale, and that the European Court of Justice has interpreted it that way.

It offers the first economic reading of the principle in the European context, tested against the Court’s case law. Innovators in AI depend on predictable rules, which makes this efficiency case for certainty timely.

Abstract

Legal certainty, a feature of the rule of law, constitutes a requirement for the operational necessities of market interactions. But, the compatibility of the principle of legal certainty with ideals such as liberalism and free market economy must not lead to the hastened conclusion that therefore the principle of legal certainty would be compatible and tantamount to the principle of economic efficiency. We intend to analyse the efficiency rationale of an important general principle of EU law—the principle of legal certainty. In this paper, we shall assert that not only does the EU legal certainty principle encapsulate an efficiency rationale, but most importantly, it has been interpreted by the ECJ as such. The economic perspective of the principle of legal certainty in the European context has, so far, never been adopted. Hence, we intend to fill in this gap and propose the representation of the principle of legal certainty as a principle of economic efficiency. After having deciphered the principle of legal certainty from a law and economics perspective (1), we shall delve into the jurisprudence of the ECJ so that the judicial reasoning of the Court as this reasoning proves the relevance of the proposed representation (2). Finally, we conclude in light of the findings of this paper (3).1

Article

Takeaway

“Not only does the EU legal certainty principle encapsulate an efficiency rationale, but most importantly, it has been interpreted by the ECJ as such.”

Quoted verbatim from the author’s abstract.

Notes

  1. Aurelien Portuese, Orla Gough & Joseph Tanega, The Principle of Legal Certainty as a Principle of Economic Efficiency, 44 Eur. J.L. & Econ. 131 (2017), https://doi.org/10.1007/s10657-014-9435-2. Abstract quoted verbatim from the publisher’s page, https://link.springer.com/article/10.1007/s10657-014-9435-2. ↩

Cite as: Aurelien Portuese, Orla Gough & Joseph Tanega, The Principle of Legal Certainty as a Principle of Economic Efficiency, 44 Eur. J.L. & Econ. 131 (2017), https://doi.org/10.1007/s10657-014-9435-2

Header image: Court of Justice of the European Union Luxembourg 01.jpg by FrDr, CC BY-SA 4.0, via Wikimedia Commons.

Newsletter

© 2026 Global AI Competition & Innovation Lab

Newsletter

© 2026 Global AI Competition & Innovation Lab

Newsletter

© 2026 Global AI Competition & Innovation Lab