Which ancient civilization first used the psychological pricing strategy of setting prices just below a round number (similar to our modern $9.99 pricing)?

The ancient world wasn't just about monuments and wars—it was also home to sophisticated marketplaces with surprising innovations in consumer psychology. From the agoras of Greece to the forums of Rome and the bazaars of Mesopotamia, merchants developed remarkably effective sales techniques that still influence modern retail. This trivia poll explores how ancient civilizations understood and manipulated consumer behavior thousands of years before modern marketing existed.

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Ancient Rome, where merchants priced items at 9 denarii instead of 10 to create the illusion of a bargain
Mesopotamian merchants, who documented prices at 29 shekels instead of 30 on clay tablets to attract buyers
Egyptian traders, who marked papyrus scrolls with prices of 4 deben rather than 5 to suggest value
Ancient Greek agora sellers, who advertised pottery at 19 drachmas instead of 20 to increase sales