The definitive textbook of antitrust law Antitrust Law was fundamental to redefining the field of antitrust law and it remains the definitive textbook for those teaching or learning the subject, Richard Posner's book has played a major role in transforming the field of antitrust law into a body of economically rational principles largely in accord with the ideas set forth in the first edition. Today's antitrust professionals may disagree on specific practices and rules, but most litigators, prosecutors, judges, and scholars agree that the primary goal of antitrust laws should be to promote economic welfare, and that economic theory should be used to determine how well business practices conform to that goal. In this thoroughly revised edition, Posner explains the economic approach to new generations of lawyers and students. "The antitrust laws are here to stay," Posner writes, "and the practical question is how to administer them better-more rationally, more accurately, more expeditiously, more efficiently." This fully revised classic will continue to be the standard work in the field.