In economics, the monetary base (also base money, money base, high-powered money, reserve money, outside money, central bank money or, in the UK, narrow money) in a country is defined as the portion of a commercial bank’s reserves that consist of the commercial bank’s accounts with its central bank plus the total currency circulating in the public, plus the currency, also known as vault cash, that is physically held in the bank’s vault.
The monetary base should not be confused with the money supply which consists of the total currency circulating in the public plus the non-bank deposits with commercial banks.
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