Analysis: Amazon, Google on collision course in 2013 - Chicago Tribune: "Amazon's fledgling ad business is still a fraction of Google's, with Robert W. Baird & Co. estimating Amazon is on track to generate about $500 million in annual advertising revenue - tiny, given it recorded $48 billion of overall revenue in 2011. By contrast, 96 percent of Google's $38 billion in 2011 sales came from advertising. . . Amazon establishes itself as a starting point for consumers looking to buy something on the Web. Research firm Forrester reported that 30 percent of U.S. online shoppers in the third quarter began researching their purchase on Amazon.com, compared with 13 percent who started on a search engine such as Google - a reversal from two years earlier when search engines were more popular starting points. Amazon now sells ads that show up to the side of product search results on its website. . . ."
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