Which ancient civilization first implemented 'psychological pricing' (prices ending in 9 or 99) for luxury goods in their marketplaces?

While modern retailers use sophisticated algorithms and market research to determine prices, ancient civilizations had their own fascinating approaches to pricing goods and services. From the complex barter systems of Mesopotamia to the standardized coinage of Rome, pricing strategies evolved alongside commerce itself. This poll explores how ancient merchants maximized their profits and how some of their innovative pricing tactics still influence modern retail psychology.

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Ancient Rome - merchants priced luxury goods at 99 denarii to make them appear more affordable to the emerging middle class
Ancient Egypt - temple merchants marked papyrus scrolls at 9 debens to suggest divine favor (as 9 was sacred to Osiris)
Phoenician traders - goods were priced at 9 shekels to avoid the 'complete number' 10, which was believed to attract tax collectors
The Mayans - luxury jade items were priced at 19 cacao beans, making them appear in a lower pricing tier than the standard 20-bean system