It is funny you mention diamonds, since they are the epitome of marketing a valueless product into something everybody (except you) wants to buy. https://www.t

It is funny you mention diamonds, since they are the epitome of marketing a valueless product into something everybody (except you) wants to buy. https://www.theatlantic.com/magazine/archive/1982/02/have-you-ever-tried-to-sell-a-diamond/304575/ https://www.theatlantic.com/magazine/archive/1982/02/have-yo... 'In its 1947 strategy plan, the advertising agency strongly emphasized a psychological approach. "We are dealing with a problem in mass psychology." '