Feeling generous? Vera Vita/Moment via Getty ImagesThe Research Brief is a short take about interesting academic work. The big idea When people feel happier, they’re more likely to donate to charity. That’s what we, two economists who study what motivates environmentally conscientious consumption and support for free services, found in a new study published in The Economic Journal. To conduct this research, we analyzed tweets from over 20,000 Twitter users who used the hashtag “#iloveWikipedia.”