This document discusses three pieces of research that show happiness is important for business performance. First, research on teams found those with a ratio of at least 3:1 positive to negative interactions performed best. Second, a study of over 140,000 employees across 11 organizations found increases in employee happiness led to better performance over time. Third, companies focused on employee happiness and satisfaction consistently outperformed financially, suggesting shareholders also benefit from prioritizing happiness. The document advocates measuring and discussing workplace happiness to create positive change.