The options they face include budget constraints, different preferences for risk, and a multitude of products and services from which to choose. If one steps back and looks at consumer behavior, it seems to be based upon a premise that is not actually stated in our book. That premise is that consumers behave rationally in their consumption expenditures. Do you believe consumers do behave rationally? Is so, how do you explain impulse buying, buying as a result of advertising or strong sales pitches, buying for purposes of conspicuous consumption, or buying to simply have something bigger and better than someone else?