Which game is credited with introducing the first large-scale 'microtransaction' system that became a standard revenue model across the gaming industry?

The gaming industry pioneered innovative retail strategies that transformed how digital products are sold. In-game purchases and virtual economies have become billion-dollar revenue streams that traditional retailers now study for insights. Test your knowledge about the evolution of virtual product marketing that changed both gaming and retail forever.

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Team Fortress 2 (2007) with its virtual hat marketplace
MapleStory (2003) with its 'Cash Shop' for cosmetic items
World of Warcraft (2004) with its character services
FarmVille (2009) with its purchasable virtual goods