In pledge drives by public radio stations, individuals who called were randomly assigned to one of two groups. In the treatment group, callers were told that a previous donor made a contribution of $300, despite the average contribution being $75 dollars. In the control group, callers were only informed of the $75 average. The treatment group gave an average of 12% more than the group only told about the average $75.
Other Applications: Eating Behavior,Health and Well Being