Demonetization is the act of stripping a currency unit of its status as legal tender. It occurs whenever there is a change in national currency. The current form or forms of money is pulled from circulation and retired, often to be replaced with new notes or coins. Sometimes, a country completely replaces the old currency with a new currency.
Removing the legal tender status of a unit of currency is a drastic intervention into an economy because it directly affects the medium of exchange used in all economic transactions. It can help stabilize existing problems, or it can cause chaos in an economy, especially if undertaken suddenly or without warning.

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