New in softcover. Hardcover was published in 2023. This book organizes the intent and purpose of the Japanese competition law (Antimonopoly Act) to address the digitalized socio-economy and provides a detailed explanation of its basic content as well as advanced issues. It includes an overview of Japanese law and its international position, a basic understanding of the big data and AI issues in today's competition law, and perspectives on high-tech regulation. In addition, it includes a variety of important topics, ranging from exploring principles to tackle digital regulatory realities, to understanding and analyzing the competitive realities of multisided markets. It also examines the relationship between information and competition law and that between consumer and competition law.