Today you will find How Full Is Your Bucket? on at the #15 spot on the WSJ bestsellers list. What is a book that came out in July 2004 doing back on the list?

My theory: the release of Tom Rath’s second book Vital Friends.

There seems to be phenomenon that a business book author’s first book gets a bump when the second comes out. I can’t show you data (yet), but I have heard this often anecdotally from authors and publishers. I am sure there is also a popularity threshold for the first book has pass, in order for this to be true.

We are working on some research, and might be able to tell you more soon on this.