But are they the best workers?
People with a happy disposition may adopt a “jack of all trades approach” investing small amounts of time in a variety of things, including social activities, at work.
Grumpy workers by contrast spend a lot of time on fewer activities thereby honing their skills. And if they find a task they like they may invest a lot of timer in it becoming very skilled.
The research published in the journal Social Psychology was carried out at the University of Illinois and the University of Pennsylvania.
So people who are the life and soul of the party may be the least productive employees.
Their opposites were characterised as less active but more focussed and less easily distracted.