A growing number of companies place a high priority on the wellbeing of their workers, assuming that happier workers will lead to improved productivity. This column examines this link based on a meta-analysis of independent studies accumulated by Gallup, covering the wellbeing and productivity of nearly 2 million employees and the performance of over 80,000 business units, originating from 230 independent organisations across 49 industries in 73 countries. The results suggest a strong positive correlation between employee wellbeing, productivity, and firm performance.