Amazon (NASDAQ: AMZN) will take a whopping 40% of online retail sales in the U.S. this year, but it's punching above its massive weight in another aspect of e-commerce. Advertising on Amazon's U.S. marketplace will generate over $18 billion this year, representing about 80% of marketers' spend on U.S. e-commerce sites, according to an estimate from eMarketer .
Amazon's dominant position in e-commerce channel advertising is bad news for Walmart (NYSE: WMT) , Target (NYSE: TGT) , and other brick-and-mortar stores who rely on in-store promotions and advertising revenue as more shopping shifts online.
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Amazon Dominates This Industry Even More Than Online Retail