What is the difference between a channel or retail sale and a Partridge Publishing sale?

If you purchased an ISBN and channel distribution, there are two different kinds of sales (if you have the distribution only through the Partridge Singapore Bookstore, which is free, then retail sales do not apply to you). When a book is bought from our website, it is considered a Partridge Singapore sale. A retail, or channel sale, is when the book is bought from any retailer other than Partridge Singapore (like Amazon.com or Barnes and Noble). The selling price must be the same for both Partridge Singapore and retail sales, but the royalty amount you’ll earn will depend on the type of sale.