Providing an extensive overview of the literature, the Elgar Encyclopedia on the Economics of Competition, Regulation and Antitrust examines perspectives on the many interrelated issues in competition economics.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.