Showcasing over 60 surveys from global leading economic and legal scholars, this Encyclopedia looks at what competition is, what it does, when it works well and when it does not. It investigates how best to protect and preserve competition through regulation or antitrust enforcement and reviews the strengths and weaknesses of the major antitrust laws along with over 100 years of Supreme Court interpretations of them. The included case studies provide historical context and also guidance for the future from the many lessons learned. This extensive Encyclopedia is a complete resource for economists wishing to extend their current knowledge on all aspects of competition, regulatory and antitrust issues. Policymakers and practitioners will find it an all-encompassing read for making positive future changes whilst understanding the decisions of the past. -- Jakob Kapeller, Heterodox Economics Newsletter This Encyclopedia provides an overview to a remarkable variety of competition topics, written by the foremost thought leaders, many of whom had personal contributions to these developments. If you are looking for industry background knowledge, key references, the latest developments, or directions for future research, look here. -- Marc Rysman, Boston University, US There has been increasing concern about lack of competition, and whether antitrust and regulatory policy should be rethought. Michael Noel has solicited contributions from many of the leading economic and legal experts in competition policy. Their contributions provide a thorough, accessible, and timely overview. -- Robert Porter, Northwestern University, Illinois, US