This document discusses consumer behavior, including its definition, models, and factors that influence it. Consumer behavior is defined as how individuals make decisions to spend their available resources (time, money, effort) on consumption-related items. The document outlines an economic model of consumer behavior that is influenced by factors like income, savings, credit availability. It also discusses personal factors (age, occupation), psychological factors (motivation, perception, learning), and cultural/social factors (culture, subculture, social class, reference groups) that shape consumer decision-making. Studying consumer behavior is important for marketers to understand purchase influences and behaviors.