http://mikeshatzkin.wpengine.com/a-coming-new-obsession-how-to-handle-a-smaller-print-book-business

One thing that has changed considerably in the last 20 years is the amount of information publishers have about what is going on in the supply chain: that is, they can track the books between their own warehouse and the end consumer purchase. The Big Kahuna of information, of course, is provided by BookScan, based on cash register capture of data as books are sold at outlets all over the country. BookScan not only lets its