Which e-commerce platform was the first to introduce a widely successful third-party marketplace model where independent sellers could list alongside the platform's own inventory?

In the fast-evolving world of e-commerce, certain platforms have changed retail forever with groundbreaking innovations. This trivia tests your knowledge about a significant technological shift that revolutionized the online marketplace ecosystem. Do you know which platform first introduced the feature that transformed how millions of small businesses sell online? Test your business acumen and see if you can identify this game-changing innovation in e-commerce history.

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Amazon (with Amazon Marketplace in 2000)
eBay (with eBay Stores in 1996)
Alibaba (with Taobao in 2003)
Walmart (with Walmart Marketplace in 2009)