Which innovative marketing strategy did ancient Egyptian merchants pioneer that is considered one of the earliest forms of brand identity in retail history?

Before modern shopping malls and e-commerce, ancient civilizations developed sophisticated retail systems that laid the groundwork for today's commerce. From the agoras of Greece to the forums of Rome and the bazaars of Mesopotamia, retail innovation has ancient roots. This trivia question explores how ancient Egyptians revolutionized retail marketing through a fascinating technique that modern brands still use today.

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Cylinder seals as product authentication marks
Distinctive pottery marks (maker's marks) to identify workshop origin
Papyrus scrolls with pictorial advertisements
Temple endorsements with priest testimonials