Since 1979 Research in Law and Economics has been presenting original research that explores the extent to which the constraints of law explain economic behavior and the role of economics in forming the law. The first chapter in this volume proposes three different definitions for market power from an antitrust perspective. Chapter two suggests a new means of measuring market power by moving away from traditional indicators of averaging industry profits. The third chapter is an analysis of efforts exerted and utilities obtained in a double lawsuit. Chapter four surveys recent developments in...