Amazon and Walmart's $74 Billion Ad Market Faces an AI Test

This article first appeared on GuruFocus. Amazon.com Inc. (AMZN, Financials) faces a potential challenge to its advertising business as artificial intelligence shopping agents change how consumers discover and purchase products online. Warning! GuruFocus has detected 5 Warning Signs with AMZN. Is AMZN fairly valued? Test your thesis with our free DCF calculator.AMZN GF Value chart Together, Amazon and Walmart control an estimated 88% of the $74.4 billion U.S. retail media ad market, Emarketer projects.Morgan Stanley experts say AI shopping assistants would contribute for 10% to 20% of U.S. e-commerce spending by 2030.