New York Times: “[Amazon.com’s] revenue from advertising and arrangements to promote other companies was $47 million, up 22 percent. Twenty percent of the items sold on Amazon are from other companies, like used-book dealers — twice the rate of a year ago. Those companies pay Amazon commissions. These arrangements, which have a high profit margin, have helped offset the costs of the discounts and the free shipping.” Twenty percent! Think about that for a minute.