Thomsen v. Sir Charles W. Cayser

Background

A group of steamship companies operating between New York and South African ports set a uniform freight rate that included a "primage" charge. They refunded the primage only to shippers who used those lines exclusively, a practice that rewarded loyalty and discouraged shipments by other vessels. Shippers sued under the Federal Anti‑trust Act, alleging overcharges and claiming damages. The case saw two trials, appeals, and conflicting rulings in the lower courts before coming here.

Reasoning

The core question was whether the companies’ concerted rate and rebate plan unlawfully restrained trade under the Antitrust Act. The Court found the facts showed a deliberate combination that excluded competitors and coerced shippers, and rejected the defendants’ argument that the so‑called "rule of reason" made the plan lawful. The Court emphasized that common carriers have a duty to compete, not to form monopolies, and that the combination operated in the United States and affected foreign commerce. It therefore held the arrangement illegal, found no reversible error in how the jury’s damages were handled, reversed the appeals court, and affirmed the trial court’s judgment for the shippers.

Real world impact

The decision prevents carriers from using exclusive rebate or loyalty schemes to fix rates and exclude competition. It confirms that injured shippers may recover for unreasonable freight overcharges under section 7 of the Antitrust Act. The ruling also makes clear that carrier agreements affecting U.S. foreign commerce fall under federal antitrust law and are subject to judicial scrutiny.