Which game first pioneered the concept of a virtual hat marketplace that eventually grew into a player-driven economy worth hundreds of millions of dollars annually?

The gaming industry has revolutionized virtual economies and in-game marketplaces, creating new retail paradigms that blur the line between digital and physical commerce. Test your knowledge about one of the most innovative retail strategies that transformed how gamers interact with virtual goods and created entirely new business models in gaming.

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Team Fortress 2
Second Life
World of Warcraft
EVE Online