Which brand strategy innovation led to a 300% increase in sales for previously midlist authors in the 2010s publishing industry?

The publishing industry has seen remarkable brand strategy innovations over the years. Major publishing houses and individual authors have created distinct brand identities to stand out in the competitive literary marketplace. This poll tests your knowledge about a groundbreaking brand strategy initiative that transformed how literary works are marketed to readers worldwide. Can you identify the correct innovation that revolutionized book marketing?

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Author-specific color schemes and typography systems that created visual brand consistency across all titles by the same writer
Publishing houses creating dedicated social media platforms exclusively for their authors' works
The introduction of scented pages that matched the book's setting (ocean scents for maritime novels, etc.)
Publishers requiring all authors to use a standardized naming convention with industry-specific prefixes