How did the Indus Valley river system facilitate trade with other river valley civilizations?

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By 1800 BCE, the Indus Valley climate grew cooler and drier, and a tectonic event may have diverted the Ghaggar Hakra river system toward the Ganges Plain. The Harappans may have migrated toward the Ganges basin in the east, where they established villages and isolated farms.

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the money supply is the total amount of money available in the economy. how do changes in the money supply affect people and businesses?