Which ancient civilization is known for using a sophisticated 'variable pricing' strategy in their marketplaces, where merchants would charge different prices to different customers based on perceived wealth?

Before modern retail giants and shopping malls, ancient civilizations had their own sophisticated commercial systems. From the bustling markets of Mesopotamia to the trade routes of the Silk Road, commerce has shaped human history for millennia. This trivia question explores how ancient civilizations approached product pricing - a strategy that might surprise you with its similarity to modern techniques!

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Ancient Phoenicians, who adjusted prices based on customers' clothing quality and jewelry
Ancient Egyptians, who had a formal pricing tier system documented on papyrus for merchants to follow
Ancient Greeks, who pioneered mathematical formulas to calculate optimal pricing for different social classes
Ancient Chinese, who used colored tokens to identify customers of different wealth brackets