This document discusses marketing information systems. It begins by explaining how information flows in markets similarly to blood in the body, and companies must collect this information to make strategic market decisions. It then explains that marketing decision makers use data from continuous information flows to solve problems. A marketing information system is defined as an interacting structure of people, equipment, and processes to gather, analyze, evaluate and distribute timely and accurate information to decision makers. The document provides examples of internal and external data sources and discusses the importance of marketing information systems for anticipating customers, taking a systematic approach, market planning, and improving efficiency.