Cases are organized over four periods: a 25-year period from 1890 to 1914 in which most of today's issues were foreshadowed; a second 25-year period from 1915 to 1939 in which the rule of reason; forced courts to investigate the actual consequences of business practices; a 35-year period from 1940 to 1975 in which the per se rule and industry concentration provided the predominant models for analysis; and the ;modern period,; now itself almost 35 years long. All Supreme Court cases since the Third Edition came out in 2005 are included, as well as recent major merger cases. The book provides professors with whatever materials they will need to help students understand and evaluate moves the Obama Administration may make in the antitrust field.