• Legitimate power—Sometimes we grant power by virtue of social agreements, such as the authority we give to police officers, soldiers, and yes, sometimes even profes¬sors. The legitimate power a uniform confers wields authority in consumer contexts, including teaching hospitals where medical students don white coats to enhance their standing with patients.2 Marketers “borrow” this form of power to influence consum¬ers. For example, an ad that shows a model who wears a white doctor's coat adds an aura of legitimacy or authority to the presentation of the product ("I'm not a doctor, but I play one on TV").