This paper has shown that the competitive significance of information sharing between competitors cannot be determined by any single feature in isolation. Whether an exchange is likely to harm competition depends on the interaction between the characteristics of the information itself, the channel through which it flows, and the structure and conditions of the market in which it occurs. Information sharing may improve forecasting, support legitimate co-operation and reduce information asymmetries, but it may also reduce strategic uncertainty and facilitate co-ordination. The central implication is therefore not that information sharing should be viewed as generally benign or generally harmful, but that its assessment remains inherently contextual. At the same time, the review of economic literature, decisional practice and guidance points to a number of developments of practical relevance.
First, recent economic research has refined some traditional heuristics, most clearly by showing that information often treated as lower risk, particularly aggregated data, may still be competitively significant where it permits sufficiently precise inference about rivals’ conduct. The paper also highlights that the mechanism through which information is shared may itself affect competitive risk.
Second, information sharing remains relevant across the three enforcement settings examined in this paper, and, with growing prominence, as a standalone competition concern. In the latter setting, the assessment can proceed through by-object or per se treatment or through effects-based analysis. The key issue is whether the characteristics of the exchange, assessed in their legal and economic context, are sufficient to justify by-object or per se treatment or instead require a fuller effects-based analysis. Future guidance could usefully clarify when particular combinations of context and information features may warrant by-object or per se treatment.
Third, concerns about information exchange through intermediaries are increasingly being applied to new technological settings. More recent guidance and case law extend established concerns with mediated exchange to common platforms, data intermediaries and algorithmic tools, while also raising questions about whether existing investigative and legal tools will remain sufficient as such systems become more opaque and complex.
For competition authorities, the practical challenge is to translate this framework into workable enforcement and guidance. Rules that are too permissive may fail to address exchanges that materially soften competition; rules that are too rigid may chill legitimate benchmarking, standard-setting or operational co-operation. The paper suggests that well-designed guidance can help firms and advisers navigate this tension, especially in recurring settings such as trade associations, broader co-operation arrangements and mandated disclosure regimes. Advocacy also has a role alongside enforcement: disclosure and transparency rules should be designed to achieve legitimate public objectives without unnecessarily facilitating rival monitoring or co-ordination.
The paper also highlights issues that merit continued attention, including how authorities should investigate and assess information exchange mediated through common digital systems or more opaque AI tools; how responsibility should be allocated where platforms or intermediaries structure or disseminate competitor information; and whether existing investigative and evidentiary tools will remain sufficient as these systems become more complex. These issues do not suggest that existing frameworks have become obsolete, but they do show that technological change will continue to test how those frameworks are applied in practice.