Want to double your productivity or that of your team? Adam Grant did an experiment with call centre employees. He randomized them into three groups with exact conditions except for what happened five minutes before their shift. Each group read a different story.
To read more:
Pink, Daniel (2012) To Sell is Human: The Surprising Truth About Moving Others
Grant, A. “The Significance of Task Significance: Job Performance Effects, Relational Mechanisms, and Boundary Conditions,” Journal of Applied Psychology 93, no 1 (2008): 108-24.