If you do not smile you are judged lacking in a “pleasing personality”—and you need to have a pleasing personality if you want to sell your services, whether as a waitress, a salesman, or a physician. Only those at the bottom of the social pyramid, who sell nothing but their physical labor, and those at the very top do not need to be particularly “pleasant.” Friendliness, cheerfulness, and everything that a smile is supposed to express, become automatic responses which one turns on and off like an electric switch.80
