http://boss.blogs.nytimes.com/2010/03/09/the-secret-to-having-happy-employees/?emc=eta1

About 10 years ago I was having my annual holiday party, and my niece had come with her newly minted M.B.A. boyfriend. As he looked around the room, he noted that my employees seemed happy. I told him that I thought they were.

Then, figuring I would take his new degree for a test drive, I asked him how he thought I did that. “I’m sure you treat them well,” he replied.

“That’s half of it,” I said. “Do you know what the other half is?”