The lion’s share of antitrust agencies’ actions is the enforcement of policies that ensure compliance and deter market players to engage in anticompetitive practices. However, credibility of competition authorities is hindered when agencies fail to enforce policies successfully. A source of ‘failed’ enforcement policies is found in judicial appeal cases against regulatory decisions, which can delay for years the effective implementation of a sanction or can even rule out the enforcement decision of an agency. Why do regulatory agencies fail to comply with legal standards in the process of enforcing the law? Answering this question can lead us to look up into different places, such as courtrooms, texts of legislation or the market structures of the economic sectors under supervision. Nevertheless, what if we look straight into the core decision-making structure of competition agencies?