Which ancient civilization pioneered the concept of specialized shopping districts with standardized store layouts featuring front-facing 'display windows' opening to main streets?

Before modern e-commerce and retail strategies, ancient civilizations developed sophisticated commercial systems that laid the foundation for today's retail practices. From the bazaars of Mesopotamia to the marketplaces of Rome, these early societies pioneered retail concepts we still use today. This trivia question explores how ancient civilizations approached store layouts - a fundamental aspect of retail strategy that has evolved over millennia but remains rooted in principles established thousands of years ago.

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Ancient Romans, with their multi-story shopping complex called Trajan's Market
Ancient Egyptians, with their temple-adjacent marketplace zones called 'per-ahket'
Ancient Chinese, with their 'Hundred Paces Shops' layout during the Han Dynasty
Ancient Mayans, with their tiered marketplace plazas called 'k'iwik'