Judge Richard Posner's opinion in Kahn v. State Oil (discussed below) was a well crafted legal maneuver. State Oil won the case against Kahn at the federal district level, with the district court judge ruling that price fixing is not--or at least should not be--a per se violation of antitrust law. Kahn appealed the case to Posner's circuit court, arguing that the district court erred in overturning established precedent in the form of Supreme Court rulings since 1968. This caused Posner to issue his brilliantly crafted opinion.
Although State Oil's defense was based on sound economic reasoning, sufficient for the district court judge to side in their favor, Kahn argued that the Supreme Court precedence still holds establishing a per se violation of federal antitrust laws for any price fixing scheme. Posner reluctantly had to agree with Kahn and overturn the ruling of the district court. (Posner was certainly aware of the controversy surrounding Robert Bork's opinion in Rothery v. Atlas Van Lines, which essentially overturned a precedent previously established by the Supreme Court.)
The gist of Posner's opinion is, "Boy, State Oil has certainly made a sound economic case that its pricing policy is efficient, reasonable, and actually protects competition, but my hands are tied by Albrecht v. Herald. Man would I love to overturn Albrecht for (insert all the reasons espoused by Posner), and if the Supreme Court would listen I bet, golly gee whiz, that they would agree with me and overturn it. This would establish a rule of reason from now on in price fixing cases. But again, at this time I can't. Although all these reasons I stated above are rational, reasonable, and pro-competitive, I simply cannot overturn a U.S. Supreme Court decision and must therefore rule in favor of Kahn. But one more time, if the Supreme Court were ever to read this opinion, I am certain that they would listen to reason and overturn Albrecht. At that time, I could then rule in favor of State Oil." (Nod, nod; wink, wink.)
State Oil appealed, the Supreme Court overturned Albrecht, and Posner was able to issue his rebuke of Kahn's arguments on remand, directing the district court to dismiss the suit against State Oil.