The Cambridge Handbook of Competition Law and Antitrust Theory reimagines competition law for an era of global, digital, and societal transformation. Authored by leading scholars across disciplines, this landmark volume explores the intersections of efficiency, fairness, freedom, innovation, and democracy in competition law and market regulation. Moving beyond doctrine, it presents competition law as a dynamic framework that both shapes and reflects broader social values. Blending theoretical rigor with policy insight, it addresses critical issues including digital platforms, innovation, sustainability, and economic power. Designed for students, academics, practitioners, and policymakers alike, this Handbook provides an engaging interdisciplinary roadmap for understanding and rethinking competition law in the twenty-first century.