Amazon dethrones Walmart as the world's biggest company by sales

In a slow-motion race of two retail behemoths, Amazon's trump card was its lucrative cloud-computing business. (Image credit: Justin Sullivan) In a slow-motion race of two retail behemoths, Amazon's trump card was its lucrative cloud-computing business. In a slow-motion race of two retail behemoths, Amazon's trump card was its lucrative cloud-computing business.