The Brussels effect is a term coined by legal scholar Anu Bradford, in an article of the same name published in the Northwestern University Law Review (volume 107), to describe how the European Union exports its regulations to the rest of the world without negotiating treaties or coercing other governments. Because the EU is a large, wealthy market with strong regulatory capacity, multinational companies often find it cheaper to apply EU rules to all their products globally than to maintain one version for Europe and another for everywhere else.
Bradford distinguishes a de facto Brussels effect, where companies voluntarily standardize on EU rules for business reasons, from a de jure Brussels effect, where other governments then copy those rules into their own law. She argues the effect is strongest when several conditions hold together: a large market, significant regulatory capacity, a tendency to set stringent standards, rules aimed at relatively inelastic targets such as consumers or production processes, and non-divisible products or practices that are hard to tailor market by market. Earlier examples include EU rules on data privacy, chemicals, and competition.
The concept has become central to AI policy because the EU AI Act and the GDPR are widely expected to shape AI practices far beyond Europe, much as GDPR reshaped global data handling. For businesses, the Brussels effect means that complying with EU AI rules may effectively become a worldwide baseline, so even firms with no European operations watch Brussels closely.