In the 1943 case of Mario Mercado e Hijos v. Commins et al., the U.S. Supreme Court ruled on a dispute involving an insurance claim for damages to a sugar mill in Puerto Rico during World War II. The plaintiff, Mario Mercado e Hijos, was denied compensation by its insurer due to war risk exclusion clauses in their policy which stated that no coverage would be provided for damage caused directly or indirectly by hostilities or warlike operations. The company argued that these exclusions were not applicable as they had been inserted into the policy without their knowledge and consent. The court held that even if this were true, it did not invalidate those provisions since they are standard in all policies issued by members of the American Foreign Insurance Association (AFIA). Furthermore, it found no evidence suggesting any fraudulent intent on part of the insurers when including these clauses. Therefore, despite sympathizing with Mercado's predicament given wartime conditions and acknowledging potential ambiguities surrounding what constitutes 'warlike operations', ultimately upheld lower court rulings denying them recovery under their insurance contract.

The dissenting opinion in the case of Mario Mercado e Hijos v. Commins et al., 1943, argued that the majority's decision to uphold a Puerto Rican law requiring all coffee grown on the island to be sold through a government agency was an overreach of governmental power and violated principles of free trade. The dissenting justices believed that this regulation interfered with private business rights without sufficient justification or public benefit. They contended that such interference should only occur when there is clear evidence of harm or unfair practices within an industry, which they did not believe had been demonstrated in this case. Furthermore, they expressed concern about potential negative impacts on competition and innovation due to excessive government control over commerce.