a psychological phenomenon that shows a pattern between a person’s initially insignificant request and then the forced fulfillment of other more burdensome demands. Another name for the phenomenon is the method of gradually strengthening requests. The phenomenon was confirmed by a series of experiments conducted by psychologists Friedman and Fraser in 1966. At present, this phenomenon is one of the classics in the history of psychology. The phenomenon is often used in the field of trade, management and services, it should also be noted that the use of this method provokes people to show altruism.