Which ancient civilization pioneered the use of 'psychological pricing' by setting prices just below whole numbers (similar to modern $9.99 pricing)?

The ancient world had sophisticated commerce systems with unique pricing approaches that influenced modern retail. From Mesopotamian clay tablets recording transactions to Roman market regulations, these civilizations developed complex pricing strategies that balanced supply chains, seasonal variations, and cultural values. Test your knowledge about how ancient merchants determined the value of their goods and services in the marketplaces that served as centers of economic and social life.

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Ancient Rome, where merchants priced items at IX denarii instead of X to create the perception of a bargain
Ancient Egypt, where prices were set at 9 debens rather than 10 to honor the deity Ennead (the nine principal gods)
Ancient China, where prices ending in 8 were preferred as the number symbolized prosperity and good fortune
Ancient Mesopotamia, where prices were set at 59 shekels instead of 60 to align with their base-60 numerical system