Which ancient Egyptian marketing technique is considered one of history's earliest forms of product endorsement?

Before digital ads and global commerce, ancient civilizations developed sophisticated marketing techniques to promote their goods. From Phoenician traders creating distinct brand markings to Roman shopkeepers' creative advertising methods, the foundations of modern product promotion have deep historical roots. This trivia question explores how ancient Egyptians leveraged an early form of celebrity endorsement in their marketplace - a strategy that continues to influence retail marketing today.

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Pharaoh's seal on luxury goods, indicating royal approval and quality
Pyramid-shaped packaging designs that promised eternal preservation of contents
Temple priest testimonials claiming divine inspiration for new products
Papyrus scrolls with illustrated customer reviews from notable citizens