John List and Uri Gneezy have appeared on our blog many times. This guest post is part a series adapted from their new book The Why Axis: Hidden Motives and the Undiscovered Economics of Everyday Life. List appeared in our recent podcast “How to Raise Money Without Killing a Kitten”; the post below offers a fuller description of an experiment discussed in that podcast.On a chilly Saturday afternoon in December, 2005, Jeanne, a bright, energetic junior at East Carolina University (ECU), trotted up the walk of a suburban home in Pitt County, N.C. Jeanne wore a shirt emblazoned with the name “ECU Natural Hazards Mitigation Research Center.” She also wore a badge with her photograph, name, and solicitation permit number on it. She knocked, and a middle-aged man opened the door. “Yes?” he said, eyeing her. “Hi,” she said, smiling brightly. “My name is Jeanne. I’m an ECU student visiting Pitt County households today on behalf of the newly formed ECU Natural Hazards Mitigation Research Center. Would you like to make a contribution today?” It’s probably safe to say that the last thing the middle-aged man had on his mind was the possibility of Jeanne being a double agent. Yes, she was really trying to raise money for the center. But she was also part of a bigger experiment involving dozens of college students knocking on the doors of 5,000 households in Pitt County.