Which retail innovation did ancient Egyptian merchants develop around 3000 BCE that revolutionized product quality verification and consumer trust?

Throughout history, ancient civilizations developed sophisticated retail systems that laid the groundwork for modern commerce. From the bustling agoras of Greece to the complex trade networks of Mesopotamia, retail innovation was central to economic growth. This trivia focuses on a fascinating retail technology that revolutionized commerce in ancient Egypt and helped establish it as a commercial powerhouse in the ancient world.

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Standardized clay seals that merchants used to guarantee product authenticity and prevent tampering
Papyrus scrolls listing customer reviews and testimonials for various products
Wooden tokens that functioned as the world's first gift cards for palace merchants
Color-coded market stalls indicating different price tiers for similar products