Are your workers happy? If not, it could be impacting your bottom line. A 2012 study showed that, controlling for factors like industry, firms listed in “100 Best Companies to Work For in America” have outperformed their peers in annual stock market growth by up to 3.8% since 1984. So is it merely coincidence? Or is happiness a secret boon to productivity? Take a look at "Happy Workers, Richer Companies" via The Atlantic to find out.