The Chicago School has produced many significant contributions to the antitrust literature of the last half century. Thanks in part to Chicago School efforts today we have an antitrust policy that is more rigorously economic, less concerned with protecting noneconomic values that are impossible...

Since Oliver Williamson published Markets and Hierarchies in 1975 transaction cost economics (TCE) has claimed an important place in antitrust, avoiding the extreme positions of the two once reigning schools of antitrust policy. At one extreme was the “structural” school, which saw market...

The court did not appreciate the difference between price setting in differentiated and undifferentiated markets. Herbert Hovenkamp (Univ. of Iowa)

A post-sale restraint is a condition or contract provision that operates after a good has been sold. In antitrust law these restraints are roughly divided into two classes, “intrabrand” and “interbrand.” An intrabrand restraint limits the way a firm can distribute the restricted...

The FTC has explicit antitrust authority to enforce the Clayton Act, although not the Sherman Act. More than a half century ago, however, the Supreme Court held that the FTC Act’s prohibition of “unfair methods of competition” reaches everything the Sherman Act reaches and also a...

In the American Needle case the Supreme Court will consider whether the NFL’s decision to give an exclusive trademark license to one firm should be counted as “unilateral” on the NFL’s part, or rather as the concerted joint venture activity of the NFL’s individual member teams. The...

The 1945 McCarran-Ferguson Act provides that federal legislation generally, including the antitrust laws, is “applicable to the business of insurance [only] to the extent that such business is not regulated by State law.” The statute was enacted after United States v. South Eastern...

A tying arrangement is a seller’s requirement that a customer may purchase its “tying” product only by taking its “tied” product. In a variable proportion tie the purchaser can vary the amount of the tied product. For example, a customer might purchase a single printer, but either a...