Amazon is willing to do a lot to gain a competitive edge... including setting up shop on a big rival's home turf, apparently. The online shopping giant has launched a store on Tmall, Alibaba's China-focused marketplace. The move requires that Amazon give Alibaba a cut of any sales, which is unusual for an internet retailer that likes to operate on thin profit margins. However, it's clear that Jeff Bezos and crew are primarily interested in getting their foot in the door. Amazon doesn't have that much clout in China compared to Alibaba, which is worth more than Amazon and eBay combined -- a Tmall storefront will at least remind Chinese customers that an American alternative exists.