Which innovative retail strategy did ancient Egyptian merchants first implement around 3000 BCE that is still considered essential in modern retail?

Before modern shopping malls and e-commerce, ancient civilizations developed sophisticated retail strategies that would influence commerce for millennia. From the agoras of Greece to the bazaars of Mesopotamia, these early retail environments established fundamental principles we still use today. This trivia question explores how ancient Egyptians implemented an early form of retail strategy that would be recognizable to modern marketers.

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Price bundling (offering multiple items at a discounted combined price)
Brand sealing (marking products with distinctive symbols to indicate quality and origin)
Seasonal clearance sales (reducing prices during harvest festivals)
Loyalty programs (providing regular customers with special privileges)