Which game first introduced a formal, developer-sanctioned marketplace for players to trade virtual items for real-world currency?

The gaming industry has revolutionized digital commerce through innovative virtual economies and marketplaces. As virtual worlds become increasingly sophisticated, game developers have created complex economic systems that mirror real-world retail strategies and consumer behaviors. Test your knowledge about a groundbreaking moment in gaming retail history that changed how we think about virtual goods and real-world value.

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Diablo III with its Real Money Auction House (2012)
Second Life with its LindeX Currency Exchange (2006)
World of Warcraft with its Token System (2015)
EVE Online with its PLEX System (2008)