Which retail innovation from ancient civilizations significantly expanded commerce by allowing merchants to display more goods in a smaller space?

The ancient world had sophisticated retail systems long before modern commerce! From Sumerian marketplaces to Roman shopping complexes, ancient civilizations developed impressive retail innovations that shaped how people bought and sold goods. Some of these technological and architectural innovations continue to influence retail spaces today. Test your knowledge about these fascinating ancient retail technologies and see if you can identify which innovation truly revolutionized commerce in the ancient world.

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The Roman taberna with folding wooden shutters that converted from storefront to counter
Egyptian market stalls with underground cold storage chambers
Greek agora's portable sundials for timing marketplace hours
Mesopotamian clay envelope packaging for protecting valuable goods