BY SAPNA MAHESHWARI, NEW YORK TIMES

Amazon's rapidly expanding influence on a wide portion of the American public has become impossible to ignore - and it is giving rise to a whole new side of the advertising industry. 

As more people live large portions of their lives in Amazon's ecosystem, ad agencies are increasingly offering specialized services to help brands take full advantage of the company's universe.

That means adding flourishes like recipes and magazine-style images to product pages, coming up with creative ways to get customers to post reviews on Amazon and plotting how companies can best connect with people who are using devices like the voice-activated Echo. 

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