I've repeatedly written about Geoffrey Miller based on the many provocative ideas presented in his earlier book, The Mating Mind. (e.g., see my earlier post, "Killer High Heels"). A gifted and entertaining writer, Miller is also an evolutionary psychologist. His forte is hauling his scientific theories out into the real world in order to persuade us that we didn't really understand some of the things that seemed most familiar to us. In his new book, Spent, Miller asks why we continuously buy all that stuff that we don't really need? Miller's answer is twofold. Yes, human animals have been physically and psychologically honed over the eons this to crave certain types of things over others to further their chances at survival and reproduction. That's only half the answer, however. We must also consider "marketing," which is

The most important invention of the past two millennia because it is the only revolution that has ever succeeded in bringing real economic power to the people. . . . it is the power to make our means of production transform the natural world into a playground for human passions.

On the upside it promises a golden age in which social institutions and markets are systematically organized on the basis of strong purple research to maximize human happiness. What science did for perception, marketing promises to do for production: it tests intuition and insight against empirical fact area market research uses mostly the same empirical tools as experimental psychology, but with larger research budgets, better-defined questions, more representative samples of people, and more social impact.