Online marketplaces are digital versions of shopping malls: Lots of merchants and lots of products in one place. In this segment, Internet Retailer senior research analyst Fareeha Ali shares details on the biggest online marketplaces in the U.S. (Amazon, eBay and the growing Walmart.com), and online marketplaces’ global leader, China’s Alibaba, culled from her research for the recently published “Online Marketplaces: A global phenomenon” report.

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