Which retail innovation, first introduced in 10th century Middle Eastern markets, revolutionized product trust and is considered a precursor to modern product reviews and quality guarantees?

Throughout history, retail and commerce have evolved dramatically. From ancient marketplaces to medieval guilds to industrial-era department stores, retail strategies have shaped economies and societies. This trivia question focuses on a pivotal retail innovation that changed how products were sold and consumed, creating ripple effects still felt in modern commerce. Test your knowledge of retail history!

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Guild certification marks - symbols stamped on products certifying quality standards and maker authenticity
Market inspector system (muhtasib) - officials who tested weights, measures, and product quality but didn't provide certification marks
Merchant reputation scrolls - written testimonials carried by traveling merchants, but not attached to individual products
Royal warranty seals - given only to suppliers of royal households, not available for common marketplace goods