In one study led by investigators at the University of Zurich in Switzerland, for example, researchers gave 50 people $100, and instructed half of them to spend it on themselves, and the other half to spend it on someone else over the next four weeks. Then, they performed functional magnetic resonance imaging (fMRI) to measure activity in the brain associated with generosity and pleasure during a social sharing task. They found that those who spent money on other people had more generous and fair interactions with other people and reported higher levels of happiness after the experiment was over.