Which ancient civilization first introduced standardized weights and measures for marketplace transactions, creating one of the earliest retail technologies for fair trade?

Before modern shopping malls and e-commerce, ancient civilizations developed sophisticated retail systems that laid the groundwork for today's commerce. From the agoras of Greece to the forums of Rome and the bazaars of Mesopotamia, retail history began thousands of years ago with innovations we still use today. This trivia question explores how ancient civilizations approached one of the earliest retail technologies that revolutionized trade and commerce.

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Ancient Egypt, with their cubit system established around 3000 BCE
Mesopotamia (specifically the Sumerians), around 3500 BCE with their shekel weight system
Indus Valley Civilization, with their binary weight system around 2600 BCE
Ancient China, during the Shang Dynasty (1600 BCE) with their bronze weight standards