Perhaps he read this http://www.freakonomics.com/2011/09/30/the-upside-of-quitting-full-transcript/ http://www.freakonomics.com/2011/09/30/the-upside-of-quitti

Perhaps he read this http://www.freakonomics.com/2011/09/30/the-upside-of-quitting-full-transcript/ http://www.freakonomics.com/2011/09/30/the-upside-of-quittin... (discussion at: https://news.ycombinator.com/item?id=3071854 https://news.ycombinator.com/item?id=3071854 )