What is the Psychoanalytic theory of consumer decision making process?

Who created the 5 step consumer decision making process in the field of consumer behaviour?

• I'm looking for a theorist or a paper showing who initiated the area for enquiry. The model is everywhere, but no one seems to know who first mentioned it...

• Answer:

  Consumer buying behaviour is a complex process and there should be a smooth process to identify the behaviour of the consumer in the market place either an individual basis or group basis. In nature behaviours of the consumers’ decisions are extremely difficult to predict which are fluctuate unexpectedly that is unique for the consumer buying behaviour. If a business thinks about all the customers in practically those all are not potential consumers.