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The term "money supply" commonly denotes the total, safe, financial assets that households and businesses can use to make payments or to hold as short-term investment. [11] The money supply is measured using the so-called "monetary aggregates", defined based on their respective level of liquidity. In the United States, for example:
However, because the depositor can ask for the money back, banks have to maintain minimum reserves to service customer needs. If the reserve requirement is 10% then, in the earlier example, the bank can lend $90 and thus the money supply increases by only $90. The reserve requirement therefore acts as a limit on this multiplier effect.
In some economics textbooks, the supply-demand equilibrium in the markets for money and reserves is represented by a simple so-called money multiplier relationship between the monetary base of the central bank and the resulting money supply including commercial bank deposits. This is a short-hand simplification which disregards several other ...
The acceptance and value of commercial bank money is based on the fact that it can be exchanged freely at a commercial bank for central bank money. [20] [21] The actual increase in the money supply through this process may be lower, as (at each step) banks may choose to hold reserves in excess of the statutory minimum, borrowers may let some ...
Consequently, the importance of the money supply as a guide for the conduct of monetary policy has diminished over time, [65] and after the 1980s central banks have shifted away from policies that focus on money supply targeting. Today, it is widely considered a weak policy, because it is not stably related to the growth of real output.
When a government spends money, its central bank debits its Treasury's operating account and credits the reserve accounts of the commercial banks. The commercial bank of the final recipient will then credit up this recipient's deposit account by issuing bank money. This spending increases the total reserve deposits in the commercial bank sector.
Full-reserve banking (also known as 100% reserve banking, or sovereign money system) is a system of banking where banks do not lend demand deposits and instead only lend from time deposits.
If, however, one additionally assumes that the two ratios C/D and R/D are exogenously determined constants, the equation implies that the central bank can control the money supply by controlling the monetary base via open-market operations: In this case, when the monetary base increases by, say, $1, the money supply will increase by $(1+C/D)/(R ...