Economic Expert Evidence Under The Microscope: Lessons From The U.K. Courts

This article first appeared in an issue of International Comparative Legal Guide - Class and Group Actions 2026.

Economic analysis can be instrumental in competition litigation cases by providing structured and rigorous frameworks and methodologies through which the effects of alleged breaches of competition law may be assessed. In recent years, economics has come to occupy a central position in competition litigation, shaping both substantive outcomes and evidentiary practice. Nonetheless, there remains considerable debate about the most effective ways of incorporating economic evidence into competition litigation proceedings. This chapter explores that debate from an economist's perspective, highlighting key principles – drawn from recent cases – that can guide the credible and effective presentation of economic evidence to assist the courts.¹