This document discusses consumer buying behavior and the consumer buying decision process. It outlines three levels of consumer problem solving - routinized response behavior for everyday purchases, limited problem solving for occasional purchases of familiar products, and extended problem solving for unfamiliar or expensive purchases. It also describes impulse buying and the five stages of the consumer buying decision process: problem recognition, information search, evaluation of alternatives, purchase, and post-purchase evaluation. Influences on the process include internal vs. external information search and the rational and situation-dependent nature of alternative evaluation.