Heading into the holiday shopping crush, there's really no comparison between Amazon and Wal-Mart when it comes to vying for shopper dollars on the Internet, said Gian Fulgoni, Executive Chairman & Co-Founder of Comscore.
Amazon has 20 percent market share of all online spending, Fulgoni told CNBC's "Squawk Box" on Wednesday. "Amazon's share is higher than the next six retailers combined. That's how powerful they are. And there's no evidence that things are slowing down for them." Read More