Consumer behaviour, also called as consumer psychology, is a branch of applied psychology, marketing and organizational behaviour. It examines consumers' decision making processes and ways in which they gather and analyze information from the environment. Utility And Behavioral Factor Utility is define as the satisfaction derived from the consumption of a commodity which determines consumption and demand behavior. As such, it is the foundation of consumer’s behavior: Cultural Factors Social Factors Personal Factors Psychological Factors Cultural Factors Cultural Factors exert the broadest and deepest influence on consumer behavior. Culture is one of the most fundamental determinant of person’s wants and behavior. While lower creatures are largely governed by instinct. Social Factors A consumer’s behavior is also influenced by social factors such as the consumer’s reference groups, family, and social roles and statuses. Reference Groups are those groups that have a direct or indirect influence on the person’s attitudes or behavior. Personal Factors A buyer’s decision are also influence by personal outward characteristic such as: the buyer’s age and life cycle, occupation, economic circumstances, lifestyle, personality, and self-concept. Psychological Factor A Person’s purchases are also influence by psychological factor: motivation, perception, learning, and beliefs and attitudes. Perception can be defined as the process by which an individual selects, organizes, and interprets information to create meaningful picture of the world. Hierarchy of Needs Physical Needs – food clothing, shelter and sleep. Safety needs – security, protection, stability, freedom from fear and anxiety, and need for structure and limits. Social Needs – need for family and friends, relationships and part of the group. Esteem Needs – refer to the reaction of the other towards, the individual, how one views him/herself, and the need for favorable judgment. Self-actualization Needs – the tendency, in spite of the lower needs being satisfied, to feel restless unless we are doing what we think we are capable of doing.