According to the principle of social proof, we often decide to do what other people like us are doing. It makes all kinds of sense since, most of the time, an action that is popular in a given situation is also functional and appropriate. Thus, an advertiser who, without using deceptive statistics, provides information that a brand of toothpaste is the largest selling or fastest growing has offered us valuable evidence about the quality of the product and the probability that we will like it.
