This book presents a conceptual framework for analyzing the definitions of State aid and subsidy in EC and WTO law. This is done through a comparative analysis, examining the coherence of the conceptual understanding of the crucial, but still elusive, issue of the definition of subsidy. The first, important finding is that the topic is not only technical but raises more fundamental questions about the objectives of subsidy control in a given legal system and, more radically, about the goals of that system itself. The analysis does not only concentrate on the state of the law but critically...