This document discusses consumer behavior and the factors that influence purchasing decisions. It covers cultural influences like subcultures and social classes, as well as social factors such as reference groups and family. Personal factors like age, personality, and lifestyle are also examined. Psychological concepts involving motivation, perception, learning, emotions and memory are reviewed. The consumer decision process is outlined, including problem recognition, information search, alternative evaluation, and post-purchase behavior. Sources of information and brand beliefs are also addressed.