Which game first successfully implemented a fully player-driven economy with its own currency that could be exchanged for real money through official channels?

The gaming industry has evolved dramatically in how it monetizes virtual worlds and in-game economies. From simple paid downloads to complex virtual marketplaces, gaming companies have pioneered innovative pricing strategies that have revolutionized digital commerce. Test your knowledge about a groundbreaking moment in gaming's economic history that changed how we think about virtual goods and real-world value.

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Second Life (Linden Labs, 2003)
World of Warcraft (Blizzard, 2004)
EVE Online (CCP Games, 2003)
EverQuest (Sony Online Entertainment, 1999)