Which ancient cultural tradition established the concept of 'market day' that still influences retail scheduling in many countries today?

Throughout history, cultural traditions have shaped retail practices worldwide. From ancient bazaars to modern shopping experiences, cultural elements have influenced when, where, and how people shop. This poll explores a fascinating aspect of retail history that connects to cultural traditions that still influence shopping patterns today. Test your knowledge about the historical development of traditional market days and their cultural significance!

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Roman 'nundinae' system - markets held every ninth day based on their calendar cycle
Chinese 'xun' tradition - markets following the 10-day week of ancient China
Mayan 'tzolkin' calendar - markets held on specific energy days of their 260-day cycle
Norse 'thing' gatherings - seasonal markets coinciding with their parliamentary assemblies