Which game first introduced a dedicated marketplace allowing players to trade virtual items for real money, establishing a developer-sanctioned virtual economy?

The gaming industry has transformed entertainment, but it's also pioneered revolutionary business models. One of the most significant innovations was the introduction of virtual economies with real-world value. Test your knowledge about a pivotal moment in gaming history that changed how developers monetize virtual worlds and how players perceive digital ownership.

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Second Life (Linden Lab, 2003)
EverQuest (Sony Online Entertainment, 1999)
World of Warcraft (Blizzard, 2004)
Ultima Online (Origin Systems, 1997)