Which literary franchise pioneered the concept of 'House Merchandising' that revolutionized how book-related products are marketed to specific consumer identity groups?

In the world of literature, book merchandising has evolved into a sophisticated art form that extends the reading experience into tangible products. Publishers and authors have found innovative ways to build brand loyalty and enhance the consumer journey through creative product extensions. Test your knowledge about how the literary world has embraced retail innovations and consumer product strategies!

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Harry Potter (Hogwarts Houses: Gryffindor, Slytherin, Hufflepuff, Ravenclaw)
The Hunger Games (Districts 1-12)
Divergent (Factions: Abnegation, Amity, Candor, Dauntless, Erudite)
Percy Jackson (Olympian Cabins)