This document analyzes Amazon's supply chain at different levels and discusses key aspects of its operations. It notes that Amazon has around 50 warehouses globally, including 20 in the US, to fulfill orders quickly. The document also discusses Amazon's multi-tier inventory model that allows for very low fixed costs. Questions and answers are provided that discuss advantages of online sales over traditional retail, how brick-and-mortar stores can benefit from online sales, and which products are better suited for online versus retail sales.