" The renowned British philosopher Alfred North Whitehead recognized this inescapable quality of modern life when he asserted that “civilization advances by extending the number of operations we can perform without thinking about them.” Take, for example, the “advance” offered to civilization by the discount coupon, which allows consumers to assume that they will receive a reduced purchase price by presenting the coupon. "

― Robert B. Cialdini , Influence: The Psychology of Persuasion