Which ancient civilization first developed the 'nilometer,' a technological innovation used by merchants to predict market conditions and set fair grain prices?

The ancient world wasn't just about monuments and warfare—it featured sophisticated commercial systems that laid the groundwork for modern retail. From standardized currency to complex trade networks spanning continents, ancient civilizations pioneered retail innovations that would influence commerce for millennia. This trivia challenges you to identify one of history's earliest technological innovations specifically designed to enhance marketplace transactions and prevent fraud.

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Ancient Egypt (circa 3000 BCE)
Mesopotamia (circa 2500 BCE)
Indus Valley (circa 2300 BCE)
Ancient China (circa 1800 BCE)