frequently the crowd is mistaken because they are not acting on the basis of any superior information but are reacting, themselves, to the principle … - Robert B. Cialdini

When our freedom to have something is limited, the item becomes less available, and we experience an increased desire for it. However, we rarely recognize that psychological reactance has caused us to want the item more; all we know is that we want it. Still, we need to make sense of our desire for the item, so we begin to assign it positive qualities to justify the desire.

people don’t care how much you know until they know how much you care.79

This parallel form of human automatic action is aptly demonstrated in an experiment by Harvard social psychologist Ellen Langer. A well-known principle of human behavior says that when we ask someone to do us a favor we will be more successful if we provide a reason. People simply like to have reasons for what they do. Langer demonstrated this unsurprising fact by asking a small favor of people waiting in line to use a library copying machine: Excuse me, I have five pages. May I use the Xerox machine because I’m in a rush? The effectiveness of this request-plus-reason was nearly total: Ninety-four percent of those asked let her skip ahead of them in line. Compare this success rate to the results when she made the request only: Excuse me, I have five pages. May I use the Xerox machine? Under those circumstances, only 60 percent of those asked complied.