What the Dog Saw by Malcom Gladwell

True Colors
"'Does she or doesn't she?' and 'Because I'm worth it' did the same thing:  they not only carried a powerful and redemptive message, but-and this was their real triumph- they suceeded in attaching that message to a five-dollar bottle of hair dye.  The lasting contribution of motivational research to Madison Avenue was to prove that you could do this for just about anything- that the products and the commercial messages with which we surround ourselves are as much a part of the psychological furniture of our lives as the relationships and emotions and experiences that are normally the subject of psychoanalytic inquiry."