Which gaming marketplace innovation first introduced the concept of players earning real-world income by creating and selling virtual items to other players?

The gaming industry has revolutionized digital marketplaces and payment systems over the past decade. In-game purchases, virtual currencies, and marketplace innovations have transformed how players discover, buy, and trade digital goods. Test your knowledge about this fascinating intersection of gaming economics and retail innovation that's reshaping how billions of dollars change hands in virtual worlds.

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• Second Life's Linden Dollar economy (2003)
• Steam Workshop (2011)
• Diablo III's Real Money Auction House (2012)
• Roblox Developer Exchange (2013)

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