People perform better when they are happy.

A happy life has more novelty, opportunity for unexpected rewards, and belief that things improve. They perceive more information, solve more problems, create new ideas—all due to possession of more dopamine.rR1

  1. David Rock, Your Brain at Work: Strategies for Overcoming Distraction, Regaining Focus, and Working Smarter All Day Long, 1st ed (New York: Harper Business, 2009). (See notes.)