Economics in its basic form began during the Bronze Age (4000-2500 BCE) with written documents in four areas of the world: Sumer and Babylonia (3500-2500 BCE); the Indus River Valley Civilization (3300-1030 BCE), in what is today's Afghanistan, Pakistan, and India; along the Yangtze River in China; and in Egypt's Nile Valley, beginning around 3500 BCE. Societies in these areas developed notation systems using markings on clay tablets, papyrus, and other materials to account for crops, livestock, and land. These accounting systems, arisingin tandem with written language, eventually included methods for tracking property transfers, recording debts and interest payments, calculating compound interest, andother economic tools still used today.
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