The policy that would be in the best interests of consumers is:
breaking up large companies to increase competition.
Increasing competition can lead to lower prices, better quality products and services, and more choices for consumers. The other options, such as increasing tariffs or decreasing minimum wage, may negatively impact consumers by raising prices or reducing income. Changing loan interest rates to encourage saving rather than borrowing could be beneficial, but it may not directly address consumer interests in the same way that increased competition would.