Influence: The Psychology of Persuasion

by Robert B. Cialdini

According to the scarcity principle, people assign more value to opportunities that are less available. The use of this principle for profit can be seen in such compliance techniques as the “limited number” and “deadline” tactics, wherein practitioners try to convince us that if we don’t act now, we will lose something of value. This engages the human tendency for loss aversion—that people are more motivated by the thought of losing something than by the thought of gaining something of equal value. The scarcity principle holds for two reasons. First, because things difficult to attain are typically more valuable, the availability of an item or experience can serve as a shortcut cue to its quality; and, because of loss aversion, we will be motivated to avoid losing something of high quality. Second, as things become less accessible, we lose freedoms. According to psychological reactance theory, we respond to the loss of freedoms by wanting to have them (along with the goods and services connected to them) more than before. As a motivator, psychological reactance is present throughout the great majority of the life span. However, it is especially evident at a pair of ages: the terrible twos and the teenage years. Both of these times are characterized by an emerging sense of individuality, which brings to prominence issues of control, rights, and freedoms. Consequently, individuals at these ages are especially averse to restrictions. In addition to its effect on the valuation...