This article is part of our special section on the DealBook Summit that included business and policy leaders from around the world. Last week at the DealBook Summit, I interviewed some of the world’s most influential leaders, among them Janet Yellen, the Treasury secretary of the United States; President Volodymyr Zelensky of Ukraine; Mark Zuckerberg, chief executive of Meta; and Andy Jassy, the chief executive of Amazon. One common theme came up in just about every conversation. It was that every decision — big and small — is ultimately a…