Monday, October 12, 1998 Published at 03:23 GMT 04:23 UK
Don't worry, be happy
The research applies to both manual and office workers
It may sound obvious, but now it is official: a happy worker is a productive worker.
A University of Sheffield study looked at 42 UK companies and asked 5,000 people about job satisfaction.
They then compared this data with the firms' annual profits. This showed with striking clarity that the greater the individual employee's satisfaction, the higher the corporate rewards.
The link was prevalent in both white-collar and manual staffs.
The authors conclude that companies would make more money by varying workers' job duties and giving them greater autonomy.