An inquiry into an alleged violator's willfulness is necessitated.
United States v. Grinnell Corp., 384 U.S. 563 (1966).
H. K. Linge,
Trade Regulations - "Monopolizing" under Section 2 of the Sherman Antitrust Act,
Duq. L. Rev.
Available at: https://dsc.duq.edu/dlr/vol5/iss2/13