Which ancient civilization is credited with establishing the first formalized 'market day' system that designated specific days of the week for commerce in different towns?

Throughout history, different cultures have established unique traditions around commerce and shopping. One of the oldest retail traditions that continues to influence modern shopping patterns is the concept of designated market days. These cultural gathering points for trade have shaped retail practices across civilizations and continue to influence contemporary shopping festivals and local commerce patterns worldwide.

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Ancient Rome with their 'nundinae' system that operated on an eight-day cycle
Ancient Egypt with their 'dekadal' markets that operated every 10 days following the Nile's cycles
Mesopotamia with their 'moon markets' that operated according to lunar phases
Ancient China with their 'xun' system that established 10-day trading cycles between neighboring regions