Zelenski, J. M., Murphy, S. A., & Jenkins, D. A. (2008). The happy-productive worker thesis revisited. Journal of Happiness Studies, 9(4), 521-537.
Zelinski, et al (2008) look at over 70 years of research realizing that little has been revealed regarding whether happier workers are more productive. Utilizing a longitudinal literature review and experience sampling methods, they examine this relationship amongst Directors in the public and private sectors and attempt to reconcile the long history of mixed findings of this happy productive worker thesis.