Amazon’s global footprint is expanding; China’s Alibaba is courting U.S. businesses to sell on its online marketplaces Taobao and Tmall; retail chains, such as Crate & Barrel and Urban Outfitters are allowing other retailers to sell on their sites; and niche marketplaces are popping up left and right.

In short, there’s lots to discuss regarding marketplaces. And with 97% of U.S. consumers shopping on online marketplaces, according to UPS and comScore Inc. research, e-retailers need to stay on top of the latest developments. I, along with many marketplace experts and retailers, will do my best to cover ground on this booming sector of e-commerce…

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