Gratitude is more powerful than we realize. In one experiment, Francesca Gino and I asked people to spend some time helping a student improve a job application cover letter. After they sent their feedback, the student replied with a message, “I just wanted to let you know that I received your feedback on my cover letter,” and asked for help with another one in the next three days. Only 32% of the people helped. When the student added just eight words—“Thank you so much! I am really grateful”—the rate of helping doubled to 66%. In another experiment, after people helped one student, a different student asked them for help. Being thanked by the first student boosted helping rates from 25% to 55%. The punch line: a little thanks goes a long way, not only for encouraging busy people to help you, but also for motivating them to help others like you.