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“Unlike traditional retailers, Amazon boasted what was called a negative operating cycle. Customers paid with their credit cards when their books shipped but Amazon settled its accounts with the book distributors only every few months. With every sale, Amazon put more cash in the bank, giving it a steady stream of capital to fund its operations and expansion.14 The company could also lay claim to a uniquely high return on invested capital. Unlike brick-and-mortar retailers, whose inventories were spread out across hundreds or thousands of stores around the country, Amazon had one website and, at that time, a single warehouse and inventory. Amazon’s ratio of fixed costs to revenue was considerably more favorable than that of its offline competitors. In other words, Bezos and Covey argued, a dollar that was plugged into Amazon’s infrastructure could lead to exponentially greater returns than a dollar that went into the infrastructure of any other retailer in the world.”
― Brad Stone, The Everything Store: Jeff Bezos and the Age of Amazon