Plus ca change, plus ca reste la meme chose. Here are models of consumer behavior, pulled from wherever, that I find especially useful in brand planning.
Maslow’s Hierarchy of Needs
You have to love this model. It explains so much about what drives us to pay our hard-earned cash for the things we “need” and “want”. It is also a useful system for creating an taxonomy of human wants, needs and impulse.
Ulterior Concepts 