Which ancient civilization first used psychological pricing (pricing just below a round number, like 9.99) to create the perception of a better deal?

Before modern marketing and consumer psychology, ancient civilizations had sophisticated methods to influence buyers in their marketplaces. From strategic product placement in Roman forums to psychological pricing tactics in Mesopotamian bazaars, these early merchants were pioneers of consumer behavior manipulation. This poll explores how ancient civilizations understood and leveraged human psychology in their commercial activities thousands of years before formal marketing theories existed.

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Mesopotamian merchants in Babylon (circa 1800 BCE)
Egyptian marketplace vendors during the New Kingdom period
Greek agora merchants during the Classical period
Roman forum traders during the early Republic