I recently read an article on ScienceDaily.com about the impact of Employee job satisfaction on the financial performance of a company:

ScienceDaily (2010-08-14) — When a JetBlue flight attendant creatively deplaned earlier this month, many questions arose as to why someone would be willing to give up a steady paycheck during these tough economic times. While this “working man’s hero” will most likely be questioning his motives as he hands over his lawyer’s fees, a new report in Perspectives on Psychological Science, suggests that his action may be a sign of trouble for JetBlue and other large companies. … read full article 

According to a new study, employers have no reason to be concerned if they hear occasional laughter coming from the work areas. On the contrary, they may even want to encourage the use of humor at the workplace, because it increases job satisfaction.

The Australian psychologist Maren Rawlings surveyed 300 workers from 20 different countries. She found that employees, who worked in a humor climate, were more satisfied with their jobs than those, who worked in a humor free climate or in a climate with negative humor like making fun of co-workers to put them down.

Previous studies have demonstrated that employees with high job satisfaction are more likely to stay in their company and are more productive.

Rawlings concludes: “If employers take measures to encourage a positive humor climate in the workplace, they are more likely to retain their staff. And with an ageing workforce it is vital for companies to keep good people.”
(from http://www.swinburne.edu.au)