The document discusses e-commerce business models and concepts. It provides an overview of key elements of a business model including value proposition, revenue model, market opportunity, competitive environment, competitive advantage, market strategy, organizational development, and management team. It then categorizes and describes various business-to-consumer and business-to-business e-commerce models such as e-tailers, community providers, content providers, portals, transaction brokers, market creators, and service providers. It also discusses how e-commerce impacts industry value chains, firm value chains, and the development of firm value webs.