This document is from a textbook on e-commerce and discusses various e-commerce business models and concepts. It provides examples of different business-to-business and business-to-consumer e-commerce models including online distributors, e-procurement companies, exchanges, consortia, private networks, and more. It also discusses how e-commerce has impacted industry structure, value chains, and business strategy. A case study on Priceline.com's business model challenges is presented at the end.