In Ancient Roman marketplaces, what psychological pricing strategy did merchants commonly use to make items appear less expensive to consumers?

Long before modern retail existed, ancient civilizations had sophisticated marketplaces with complex pricing strategies and consumer psychology. From the agoras of Ancient Greece to the bazaars of Mesopotamia, merchants understood the psychology of their customers and employed various techniques to drive sales. This poll explores how ancient civilizations approached what we now call 'consumer psychology' in their commercial practices.

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They priced items in fractions of an as (Roman bronze coin), creating the ancient equivalent of the 99-cent pricing we see today
They marked prices with red ink to trigger excitement and impulse purchases, a practice documented in Pompeii market stalls
They always quoted prices in silver denarii rather than copper asses, making the numerical values appear smaller
They implemented a 'buy from the praefectus annonae (grain prefect)' guarantee, suggesting imperial quality assurance