Jefferson Parish Hospital Dist. No. 2 v. Hyde
In Jefferson Parish Hospital Dist. No. 2 v. Hyde, 466 U.S. 2 (1984), the U.S. Supreme Court held that a plaintiff challenging the practice of exclusive contracts by hospitals under antitrust laws must prove a negative impact of these contracts on the market to prevail.
A harmful effect on the overall market was unlikely in this case because this particular hospital had perhaps only 30% of market share.