As CEO of Zappos.com, Tony Hsieh sells more than $1 billion worth of shoes and other merchandise a year. Now he's selling happiness as the cornerstone of commerce in his book "Delivering Happiness: A Path to Profits, Passion, and Purpose."

As CEO of Zappos.com, Tony Hsieh sells more than $1 billion worth of shoes and other merchandise a year. Now he's selling happiness as the cornerstone of commerce in his book "Delivering Happiness: A Path to Profits, Passion, and Purpose."