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Happiness is a critical factor for work, and work is a critical factor for happiness. In one of those life-isn’t-fair results, it turns out that the happy out-perform the less happy.

"Balanced Life — Want To Be Happy at Work? Dozens of Tips, Plus a Few Quizzes, To Consider" by Gretchen Rubin, www.huffingtonpost.com. July 19, 2010.
Happiness is a critical factor for work, and work is a critical factor for happiness. In one of those life-isn’t-fair results, it turns out that the happy out-perform the less happy.