The use of economic theory and economic evidence in competition cases their appropriate interpretation meaning impact usefulness and validity are among the most challenging issues that judges and legal practitioners are facing in their daily decisionmaking. Notorious questions of for example how courts practitioners and other decisionmaking bodies should employ economic evidence and what weight and credibility should be attached to such evidence where different experts offer different suggestions are among the most complex ones. This book while addressing such questions provides tools for judges scholars and legal practitioners to employ economic evidence in a more effective optimal and predictable way so as to overcome the identified EUwide obstacles in enforcing current EU competition law.This edited volume address the importance implications practices problems and the role of economic evidence in EU competition law.