Consumer behavior is the stuy of how people buy, what they buy, when they buy and why they buy. It blends elements from psychology, sociology, sociopsychology, anthropology and economics. It attempts to understand the buyer decision making process, both individually and in groups. It studies characteristics of individual consumers such as demographics, psychographics, and behavioural variables in an attempt to understand people's wants. It also tries to assess influences on the consumer from groups such as family, friends, reference groups, and society in general.