Every month one of the tools some store owners use to direct customers to what book to purchase is from the Best-sellers List. Some store owners find the list is especially helpful for customers who aren’t sure what they want to buy when they get to the store. Some are seeking the newest best seller, while others use the list to narrow the search for what to buy. Either way most marketing experts agree, having an informed staff can help steer customers to making a purchase. And the best seller list can help generate in store displays and online buzz.