Which ancient civilization first developed a standardized system of weights and measures specifically for retail marketplace transactions, creating the world's first reliable 'point of sale' verification system?

Before modern e-commerce platforms and digital payment systems, ancient civilizations developed sophisticated retail networks that laid the groundwork for today's commercial practices. From Mesopotamian clay tablets tracking inventory to Roman market complexes with specialized vendor stalls, the ancient world pioneered retail concepts we still use. This trivia question explores how one particular civilization revolutionized early retail systems with an innovation that would influence commerce for millennia to come.

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Mesopotamia (circa 3000 BCE), with their cuneiform-inscribed clay weight stones and standardized volume containers
Ancient Egypt (circa 2500 BCE), with their hieroglyphic-marked stone weights and royal cubit measuring rods
Indus Valley Civilization (circa 2600 BCE), with their precision-carved cubic stone weights and standardized measurement vessels
Ancient China (circa 2100 BCE), with their bronze weight sets and standard volume measures established under the Xia Dynasty