Which game pioneered the concept of a persistent virtual marketplace where players could buy and sell cosmetic items using real currency, leading to the creation of a billion-dollar virtual economy?

The intersection of gaming and retail has created fascinating new consumer experiences and revenue streams. Virtual marketplaces within games have evolved from simple in-app purchases to sophisticated commerce platforms with their own economies, currencies, and marketing strategies. Test your knowledge about this revolutionary retail innovation that has transformed how brands engage with gaming audiences and how players interact with products in virtual worlds.

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Team Fortress 2 (Valve, 2007) with its introduction of the Mann Co. Store
World of Warcraft (Blizzard, 2004) with its auction house system
Second Life (Linden Lab, 2003) with its Linden Dollar marketplace
Minecraft (Mojang, 2011) with its Minecraft Marketplace