There are two types of book distribution for physical copies: print - on - demand (POD) and expanded distribution. (millcitypress.net)
You are the publisher and have to take the discounts required in book distribution into account when setting your prices and calculating production costs, as every publisher must do. (thebookdesigner.com)
Each of the four short points above provide a brief overview of book distribution for self publishers. (thecadencegrp.com)