Brief for Amicus Curiae, Professor John Yun in Support of Appellant, X Corp. v. World Federation of Advertisers (5th Cir. No. 26-10394)
This amicus brief critiques the district court's holding that a group boycott plaintiff suffers antitrust injury only when the challenged coordination involves the plaintiff's competitor(s). Specifically, when members of a trade association jointly negotiate to improve the bargaining terms on which they deal with a trading partner, the harm falls directly on that partner, as in Professional Engineers, Trial Lawyers, and Indiana Federation of Dentists. Fifth Circuit precedent likewise confirms that a horizontal agreement need not involve, directly or indirectly, the victim's competitors; thus, the district court improperly narrowed the standing requirement. Additionally, an anticompetitive agreement may be manifested through an authority delegated to trade association leadership—such as, in the Supreme Court’s decision in Hydrolevel—so that Twombly's conscious-parallelism concerns are not implicated.