The role of the EU competition law rules in shaping the EU Internal Market can hardly be overstated. The EU substantive rules dealing with cartels, abuse of dominance and State aid have ensured, in the past decades, a much desired unity of the law applied in the diverse European markets. Yet, much of the success of the EU competition law provisions depends on its practical enforcement. The proliferation of competition law enforcement, especially since 2004, stands testimony in this respect. However, this has not come without challenges. In this context, this book aims to critically discuss certain key elements relating to the domestic enforcement of the said rules, in order to place the discussion of further boosting this enforcement exercise in the correct context. This book aims, in this respect, to find an answer to the following question: to what extent would boosting the domestic enforcement of the EU competition law rules aid the ambition of more forceful, better targeted and more resource-efficient EU competition law enforcement in the Internal Market? Topics such as the following are discussed in the contributions included in this book: the sufficiency of the enforcement toolbox of national competition authorities, the interaction between fundamental rights and competition law, and the duties of domestic bodies in this context.