In 1926, a commission from the U.S. House of Representatives conducted studies that resulted in a report accusing São Paulo of monopolizing the coffee market. The commission claimed that this monopoly led to an increase of approximately $135 million in annual expenses for coffee purchases in the United States, attributing the price inflation directly to Brazil's influence on the product. This report highlighted the potential economic implications of foreign monopolies on critical goods like coffee.

The commission's findings also drew attention to similar monopolistic practices in other countries, specifically noting the United Kingdom's control over rubber. The report underlined the urgent need for the United States to address the issue of foreign monopolies over raw materials, which could significantly affect national interests and pricing frameworks. The implications of this monopoly claim extended beyond coffee, suggesting a broader concern regarding international trade dependencies.

Moreover, the accusation against São Paulo signifies the intense scrutiny on agricultural commodities and trade relationships during that era. As Brazil held a prominent position in the coffee supply chain, the call for intervention highlighted a growing awareness of the complexities and power dynamics in global commodity markets. Policymakers in the U.S. were urged to consider strategies to mitigate dependency on foreign commodities, which could ensure better control over domestic prices and supply stability.