In monetary economics, redenomination is the process of changing the face value of banknotes and coins in circulation. It may be done because inflation has made the currency unit so small that only large denominations of the currency are in circulation. In such cases the name of the currency may change or the original name may be used with a temporary qualifier such as "new". Redenomination may be done for other reasons such as changing over to a new currency such as the Euro or during decimalisation.

Redenomination itself is considered symbolic as it does not have any impact on a country's exchange rate in relation to other currencies. It may, however, have a psychological impact on the population by suggesting that a period of hyperinflation is over, and is not a reminder of how much inflation has impacted them. The reduction in the number of zeros also improves the image of the country abroad.

Inflation over time is the main cause for the purchasing power of the monetary unit decreasing; but there are a variety of political reasons for the government not reining in inflation or for not redenominating the currency when its value has depreciated significantly. There are some economic and social benefits of redenominating, including improved efficiency in processing routine transactions. Redenomination typically involves the substitution of new banknotes in place of the old ones, which usually cease being legal tender after the end of a short transition period.

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