This document summarizes factors that influence consumer buying behavior, including cultural, social, personal, and psychological factors. It discusses how marketers consider cultural shifts and social classes to discover new product opportunities. Family, roles, status, reference groups, age, life stage, lifestyle, occupation, personality, motivation, perception, learning, and beliefs also impact consumer purchasing. The document was presented by a group of students for a Principles of Marketing class. It aims to explain the various internal and external factors studied by marketers to understand consumer behavior.