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to roughly 3500 BC. What these texts revealed was that credit systems of exactly this sort actually preceded the invention of coinage by thousands of years. The Mesopotamian system is the best documented, more so than that of Pharaonic Egypt (which appears similar), Shang China (about which we know little), or the Indus Valley civilization (about which we know nothing at all). As it happens, we know a great deal about Mesopotamia, since the vast majority of cuneiform documents were financial in nature.
