The document provides an analysis of the operations models of Amazon and Walmart. It discusses the evolution of Amazon from an online bookstore to expanding into multiple product categories and countries. It describes Amazon's business models as a seller, intermediary, and ecommerce service provider. It also outlines Amazon's inventory network and strategies used in different countries. For Walmart, it discusses the company's supply chain network components and traditional vs internet retail supply chain structures. It then analyzes key aspects of both companies' operations models including sourcing and procurement, production, planning and distribution, logistics, inventory management, and fulfillment and customer service. [END SUMMARY]